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Datasheet: 89C1051U (ATMEL Corporation)

8-bit Microcontroller With 1k Bytes Flash

 

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ATMEL Corporation
1
Pin Configuration
PDIP/SOIC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
RST/VPP
(RXD) P3.0
(TXD) P3.1
XTAL2
XTAL1
(INT0) P3.2
(INT1) P3.3
(T0) P3.4
(T1) P3.5
GND
VCC
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1 (AIN1)
P1.0 (AIN0)
P3.7
Features
Compatible with MCS-51
TM
Products
1K Bytes of Reprogrammable Flash Memory
Endurance: 1,000 Write/Erase Cycles
2.7V to 6V Operating Range
Fully Static Operation: 0 Hz to 24 MHz
Two-Level Program Memory Lock
64 x 8-Bit Internal RAM
15 Programmable I/O Lines
Two 16-Bit Timer/Counters
Six Interrupt Sources
Programmable Serial UART Channel
Direct LED Drive Outputs
On-Chip Analog Comparator
Low Power Idle and Power Down Modes
Description
The AT89C1051U is a low-voltage, high-performance CMOS 8-bit microcomputer with
1K bytes of Flash programmable and erasable read only memory. It has the same
functionality and operation as the AT89C1051 with the addition of a UART program-
mable serial port. The device is manufactured using Atmel's high-density nonvolatile
memory technology and is compatible with the industry standard MCS-51
TM
instruction
set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel
AT89C1051U is a powerful microcomputer which provides a highly flexible and cost
effective solution to many embedded control applications.
The AT89C1051U provides the following standard features: 1K bytes of Flash, 64
bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt
architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator
and clock circuitry. In addition, the AT89C1051U is designed with static logic for oper-
ation down to zero frequency and supports two software-selectable power saving
modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial
port and interrupt system to continue functioning. The Power Down Mode saves the
RAM contents but freezes the oscillator disabling all other chip functions until the next
hardware reset.
Rev. 1045A05/98
8-Bit
Microcontroller
with 1K Bytes
Flash
AT89C1051U
Preliminary
AT89C1051U
2
Block Diagram
VCC
GND
RAM ADDR.
REGISTER
RAM
FLASH
STACK
POINTER
ACC
B
REGISTER
TMP2
TMP1
ALU
PSW
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PROGRAM
ADDRESS
REGISTER
BUFFER
PC
INCREMENTER
PROGRAM
COUNTER
DPTR
ANALOG
COMPARATOR
PORT1
LATCH
PORT3
LATCH
PORT1 DRIVERS
PORT3 DRIVERS
OSC
RST
P1.0 - P1.7
P3.0 - P3.5
P3.7
AT89C1051U
3
Pin Description
V
CC
Supply voltage.
GND
Ground.
Port 1
Port 1 is an 8-bit bidirectional I/O port. Port pins P1.2 to
P1.7 provide internal pullups. P1.0 and P1.1 require exter-
nal pullups. P1.0 and P1.1 also serve as the positive input
(AIN0) and the negative input (AIN1), respectively, of the
on-chip precision analog comparator. The Port 1 output
buffers can sink 20 mA and can drive LED displays directly.
When 1s are written to Port 1 pins, they can be used as
inputs. When pins P1.2 to P1.7 are used as inputs and are
externally pulled low, they will source current (I
IL
) because
of the internal pullups.
Port 1 also receives code data during Flash programming
and verification.
Port 3
Port 3 pins P3.0 to P3.5, P3.7 are seven bidirectional I/O
pins with internal pullups. P3.6 is hard-wired as an input to
the output of the on-chip comparator and is not accessible
as a general purpose I/O pin. The Port 3 output buffers can
sink 20 mA. When 1s are written to Port 3 pins they are
pulled high by the internal pullups and can be used as
inputs. As inputs, Port 3 pins that are externally being
pulled low will source current (I
IL
) because of the pullups.
Port 3 also serves the functions of various special features
of the AT89C1051U as listed below:
Port 3 also receives some control signals for Flash pro-
gramming and verification.
RST
Reset input. All I/O pins are reset to 1s as soon as RST
goes high. Holding the RST pin high for two machine cycles
while the oscillator is running resets the device.
Each machine cycle takes 12 oscillator or clock cycles.
XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier.
Oscillator Characteristics
XTAL1 and XTAL2 are the input and output, respectively,
of an inverting amplifier which can be configured for use as
an on-chip oscillator, as shown in Figure 1. Either a quartz
crystal or ceramic resonator may be used. To drive the
device from an external clock source, XTAL2 should be left
unconnected while XTAL1 is driven as shown in Figure 2.
There are no requirements on the duty cycle of the external
clock signal, since the input to the internal clocking circuitry
is through a divide-by-two flip-flop, but minimum and maxi-
mum voltage high and low time specifications must be
observed.
Figure 1. Oscillator Connections
Note:
C1, C2= 30 pF
10 pF for Crystals
= 40 pF
10 pF for Ceramic Resonators
Figure 2. External Clock Drive Configuration
Port Pin
Alternate Functions
P3.0
RXD (serial input port)
P3.1
TXD (serial output port)
P3.2
INT0 (external interrupt 0)
P3.3
INT1 (external interrupt 1)
P3.4
T0 (timer 0 external input)
P3.5
T1 (timer 1 external input)
AT89C1051U
4
Special Function Registers
A map of the on-chip memory area called the Special Func-
tion Register (SFR) space is shown in the table below.
Note that not all of the addresses are occupied, and unoc-
cupied addresses may not be implemented on the chip.
Read accesses to these addresses will in general return
random data, and write accesses will have an indetermi-
nate effect.
User software should not write 1s to these unlisted loca-
tions, since they may be used in future products to invoke
new features. In that case, the reset or inactive values of
the new bits will always be 0.
Table 1. AT89C1051U SFR Map and Reset Values
0F8H
0FFH
0F0H
B
00000000
0F7H
0E8H
0EFH
0E0H
ACC
00000000
0E7H
0D8H
0DFH
0D0H
PSW
00000000
0D7H
0C8H
0CFH
0C0H
0C7H
0B8H
IP
XXX00000
0BFH
0B0H
P3
11111111
0B7H
0A8H
IE
0XX00000
0AFH
0A0H
0A7H
98H
SCON
00000000
SBUF
XXXXXXXX
9FH
90H
P1
11111111
97H
88H
TCON
00000000
TMOD
00000000
TL0
00000000
TL1
00000000
TH0
00000000
TH1
00000000
8FH
80H
SP
00000111
DPL
00000000
DPH
00000000
PCON
0XXX0000
87H
AT89C1051U
5
Restrictions on Certain Instructions
The AT89C1051U and is an economical and cost-effective
member of Atmel's growing family of microcontrollers. It
contains 1K bytes of flash program memory. It is fully com-
patible with the MCS-51 architecture, and can be pro-
grammed using the MCS-51 instruction set. However, there
are a few considerations one must keep in mind when uti-
lizing certain instructions to program this device.
All the instructions related to jumping or branching should
be restricted such that the destination address falls within
the physical program memory space of the device, which is
1K for the AT89C1051U. This should be the responsibility
of the software programmer. For example, LJMP 3FEH
would be a valid instruction for the AT89C1051U (with 1K
of memory), whereas LJMP 410H would not.
1. Branching instructions:
LCALL, LJMP, ACALL, AJMP, SJMP, JMP @A+DPTR
These unconditional branching instructions will execute
correctly as long as the programmer keeps in mind that the
destination branching address must fall within the physical
boundaries of the program memory size (locations 00H to
3FFH for the 89C1051U). Violating the physical space lim-
its may cause unknown program behavior.
CJNE [...], DJNZ [...], JB, JNB, JC, JNC, JBC, JZ, JNZ With
these conditional branching instructions the same rule
above applies. Again, violating the memory boundaries
may cause erratic execution.
For applications involving interrupts the normal interrupt
service routine address locations of the 80C51 family archi-
tecture have been preserved.
2. MOVX-related instructions, Data Memory:
The AT89C1051U contains 64 bytes of internal data mem-
ory. Thus, in the AT89C1051U the stack depth is limited to
64 bytes, the amount of available RAM. External DATA
memory access is not supported in this device, nor is exter-
nal PROGRAM memory execution. Therefore, no MOVX
[...] instructions should be included in the program.
A typical 80C51 assembler will still assemble instructions,
even if they are written in violation of the restrictions men-
tioned above. It is the responsibility of the controller user to
know the physical features and limitations of the device
being used and adjust the instructions used correspond-
ingly.
Programmable Serial UART Channel
(1)
The AT89C1051U offers a programmable serial port which
is compatible with the serial ports on other AT89 series
flash MCU products. A detailed description of the serial port
operation can be found in the Hardware Description section
of the Atmel AT89 series flash MCU data book.
Note:
1.
This feature is not available on the AT89C1051.
Program Memory Lock Bits
On the chip are two lock bits which can be left unpro-
grammed (U) or can be programmed (P) to obtain the addi-
tional features listed in the table below:
Note:
1. The Lock Bits can only be erased with the Chip Erase
operation.
Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-
chip peripherals remain active. The mode is invoked by
software. The content of the on-chip RAM and all the spe-
cial functions registers remain unchanged during this
mode. The idle mode can be terminated by any enabled
interrupt or by a hardware reset.
P1.0 and P1.1 should be set to '0' if no external pullups are
used, or set to '1' if external pullups are used.
It should be noted that when idle is terminated by a hard-
ware reset, the device normally resumes program execu-
tion, from where it left off, up to two machine cycles before
the internal reset algorithm takes control. On-chip hardware
inhibits access to internal RAM in this event, but access to
the port pins is not inhibited. To eliminate the possibility of
an unexpected write to a port pin when Idle is terminated by
reset, the instruction following the one that invokes Idle
should not be one that writes to a port pin or to external
memory.
Power Down Mode
In the power down mode the oscillator is stopped, and the
instruction that invokes power down is the last instruction
executed. The on-chip RAM and Special Function Regis-
ters retain their values until the power down mode is termi-
nated. The only exit from power down is a hardware reset.
Reset redefines the SFRs but does not change the on-chip
RAM. The reset should not be activated before V
CC
is
restored to its normal operating level and must be held
active long enough to allow the oscillator to restart and sta-
bilize.
P1.0 and P1.1 should be set to '0' if no external pullups are
used, or set to '1' if external pullups are used.
Lock Bit Protection Modes
(1)
Program Lock Bits
LB1
LB2
Protection Type
1
U
U
No program lock features.
2
P
U
Further programming of the Flash
is disabled.
3
P
P
Same as mode 2, also verify is
disabled.
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