IN87C51N Datasheet, PDF (1/2 Pages) Integral Corp. – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 4K BYTES OF EPROM MEMORY

IN87C51N
CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
WITH 4K BYTES OF EPROM MEMORY
The 87C51 is the EPROM version of the 80C51. Microcontroller fabricated with high-
density CMOS technology. It contains 4K bytes of on chip Program memory that can be
electrically programmed The 80C51 contains a 4k x 8 ROM , a 128 x 8 RAM , 32 I/O lines,
two 16-bit counter/timers, a five-source, two-priority level nested interrupt structure, a
serial I/O port for either multi-processor communications, I/O expansion or full duplex
UART, and on-chip oscillator and clock circuits.
The device has two software selectable modes of power reduction  idle mode and
power-down mode. The idle mode freezes the CPU while allowing the RAM, timers, serial
port, and interrupt system to continue functioning. The power-down mode saves the RAM
contents but freezes the oscillator, causing all other chip functions to be inoperative.
FEATURES
PIN CONFIGURATIONS
8031/8051 compatible
 4K EPROM
(MCS-51 family)
 128 x 8 RAM
 Two 16-bit counter/timers
 Full duplex serial channel
 Boolean processor
 Memory addressing capability
 64k ROM and 64k RAM
 Power control modes:
 Idle mode
 Power-down mode
 CMOS and TTL compatible
 Two speed ranges at V_CC=5V
 12 MHz
 16 MHz
P 1 .0 1
P 1 .1 2
P 1 .2 3
P 1 .3 4
P 1 .4 5
P 1 .5 6
P 1 .6 7
P 1 .7 8
RST
R xD /P 3 .0
T xD /P3.2
9
P L A S T IC
DUAL
10 _{IN -LIN E}
PACKAGE
11
IN T 0/P 3.2 12
IN T 1/P 3.3 13
T 0/P 3.4
14
T 1/P 3.5
15
W R /P36 16
R D /P 3 .7 17
XTAL2 18
XTAL1 19
Vss 20
40 Vcc
39 P 0.0 /A D 0
38 P 0.1 /A D 1
37 P 0.2 /A D 2
36 P 0.3 /A D 3
35 P 0.4 /A D 4
34 P 0.5 /A D 5
33 P 0.6 /A D 6
32 P 0.7 /A D 6
31 E A /V pr
30 A L E /P P O G
29 PSEN
28 P 2.7 /A 15
27 P 2.6 /A 14
26 P 2.5 /A 13
25 P 2.4 /A 12
24 P 2.3 /A 11
23 P 2.2 /A 10
22 P 2.1 /A 9
21 P 2.0 /A 8
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