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IS89C51
Integrated Silicon Solution, Inc. — 1-800-379-4774
1
MC016-1C
11/21/98
ISSI
ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which
may appear in this publication. Copyright 1998, Integrated Silicon Solution, Inc.
IS89C51
CMOS SINGLE CHIP
8-BIT MICROCONTROLLER
with 4-Kbytes of FLASH
NOVEMBER 1998
FEATURES
80C51 based architecture
4-Kbytes of on-chip Reprogrammable Flash
Memory
128 x 8 RAM
Two 16-bit Timer/Counters
Full duplex serial channel
Boolean processor
Four 8-bit I/O ports, 32 I/O lines
Memory addressing capability
– 64K ROM and 64K RAM
Program memory lock
– Lock bits (3)
Power save modes:
– Idle and power-down
Six interrupt sources
Most instructions execute in 0.3
s
CMOS and TTL compatible
Maximum speed: 40 MHz @ Vcc = 5V
Industrial temperature available
Packages available:
– 40-pin DIP
– 44-pin PLCC
– 44-pin PQFP
GENERAL DESCRIPTION
The
ISSI IS89C51 is a high-performance microcontroller
fabricated using high-density CMOS technology. The
CMOS IS89C51 is functionally compatible with the
industry standard 80C51 microcontrollers.
The IS89C51 is designed with 4-Kbytes of Flash
memory, 128 x 8 RAM; 32 programmable I/O lines; a serial
I/O port for either multiprocessor communications, I/O
expansion or full duplex UART; two 16-bit timer/counters;
an six-source, two-priority-level, nested interrupt structure;
and an on-chip oscillator and clock circuit. The IS89C51
can be expanded using standard TTL compatible memory.
Figure 1. IS89C51 Pin Configuration: 40-pin PDIP
ISSI
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
RxD/P3.0
TxD/P3.1
INT0/P3.2
INT1/P3.3
T0/P3.4
T1/P3.5
WR/P3.6
RD/P3.7
XTAL2
XTAL1
GND
VCC
P0.0/AD0
P0.1/AD1
P0.2/AD2
P0.3/AD3
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA/VPP
ALE/PROG
PSEN
P2.7/A15
P2.6/A14
P2.5/A13
P2.4/A12
P2.3/A11
P2.2/A10
P2.1/A9
P2.0/A8