Features
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Compatible with MCS-51
™
Products
•
1K Bytes of Reprogrammable Flash Memory
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– 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
™
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.
8-Bit
Microcontroller
with 1K Bytes
Flash
AT89C1051U
Preliminary
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
19
18
17
16
15
14
13
12
11
VCC
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1 (AIN1)
P1.0 (AIN0)
P3.7
Rev. 1045A–05/98
1
ATMEL [ ATMEL CORPORATION ]
