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Atmel Electronic Components Datasheet

89C1051U Datasheet

8-Bit Microcontroller with 1K Bytes Flash

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Features
Compatible with MCS-51Products
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-51instruction
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.
Pin Configuration
PDIP/SOIC
RST/VPP
(RXD) P3.0
(TXD) P3.1
XTAL2
XTAL1
(INT0) P3.2
(INT1) P3.3
(T0) P3.4
(T1) P3.5
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 P1.7
18 P1.6
17 P1.5
16 P1.4
15 P1.3
14 P1.2
13 P1.1 (AIN1)
12 P1.0 (AIN0)
11 P3.7
8-Bit
Microcontroller
with 1K Bytes
Flash
AT89C1051U
Preliminary
Rev. 1045A–05/98
1


Atmel Electronic Components Datasheet

89C1051U Datasheet

8-Bit Microcontroller with 1K Bytes Flash

No Preview Available !

Block Diagram
VCC
GND
RAM ADDR.
REGISTER
RAM
FLASH
RST
B
REGISTER
ACC
STACK
POINTER
PROGRAM
ADDRESS
REGISTER
TMP2
TMP1
BUFFER
ALU
PSW
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
ANALOG
COMPARATOR
PORT1
LATCH
PORT3
LATCH
OSC
PORT1 DRIVERS
PORT3 DRIVERS
PC
INCREMENTER
PROGRAM
COUNTER
DPTR
P1.0 - P1.7
P3.0 - P3.5
P3.7
2 AT89C1051U


Part Number 89C1051U
Description 8-Bit Microcontroller with 1K Bytes Flash
Maker ATMEL Corporation
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89C1051U Datasheet PDF






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1 89C1051U 8-Bit Microcontroller with 1K Bytes Flash
ATMEL Corporation





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