AT89C1051U_00 Datasheet, PDF (1/15 Pages) ATMEL Corporation – 8-bit Microcontroller with 1K Byte Flash

Features
• Compatible with MCS-51^™ 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 byte of Flash programmable and erasable read only memory. It has the same func-
tionality and operation as the AT89C1051 with the addition of a UART programmable
serial port. The device is manufactured using Atmel’s high-density nonvolatile memory
technology and is compatible with the industry-standard MCS-51 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 byte of Flash, 64 bytes
of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt archi-
tecture, 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 operation
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 con-
tents but freezes the oscillator disabling all other chip functions until the next hardware
reset.
8-bit
Microcontroller
with 1K Byte
Flash
AT89C1051U
Pin Configuration
PDIP/SOIC
RST/VPP 1
(RXD) P3.0 2
(TXD) P3.1 3
XTAL2 4
XTAL1 5
(INT0) P3.2 6
(INT1) P3.3 7
(TO) P3.4 8
(T1) P3.5 9
GND 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
Rev. 1045C–02/00
1