Philips Semiconductors
Product specification
CMOS single-chip 8-bit microcontrollers
80C31/80C51/87C51
DESCRIPTION
PIN CONFIGURATIONS
The Philips 80C31/80C51/87C51 is a high-performance
microcontroller fabricated with Philips high-density CMOS
technology. The CMOS 8XC51 is functionally compatible with the
NMOS 8031/8051 microcontrollers. The Philips CMOS technology
combines the high speed and density characteristics of HMOS with
the low power attributes of CMOS. Philips epitaxial substrate
minimizes latch-up sensitivity.
P1.0
P1.1
40
V
1
2
3
CC
P0.0/AD0
P0.1/AD1
39
38
P1.2
37 P0.2/AD2
36
P1.3
P1.4
4
5
P0.3/AD3
35 P0.4/AD4
34
The 8XC51 contains a 4k × 8 ROM (80C51) EPROM (87C51), a 128
× 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.
P1.5
P1.6
P1.7
RST
6
7
8
9
P0.5/AD5
33 P0.6/AD6
32
31
30
P0.7/AD7
CERAMIC
AND
PLASTIC
DUAL
IN-LINE
PACKAGE
In addition, 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.
EA/V
PP
RxD/P3.0 10
TxD/P3.1 11
INT0/P3.2 12
ALE/PROG
29 PSEN
13
28 P2.7/A15
27 P2.6/A14
INT1/P3.3
T0/P3.4 14
T1/P3.5 15
WR/P3.6 16
RD/P3.7 17
XTAL2 18
XTAL1 19
26
P2.5/A13
FEATURES
25 P2.4/A12
24 P2.3/A11
• 8031/8051 compatible
– 4k × 8 ROM (80C51)
– 4k × 8 EPROM (87C51)
– ROMless (80C31)
23
22
21
P2.2/A10
P2.1/A9
P2.0/A8
– 128 × 8 RAM
20
V
SS
– Two 16-bit counter/timers
– Full duplex serial channel
– Boolean processor
6
1
40
• Memory addressing capability
– 64k ROM and 64k RAM
7
39
29
CERAMIC
AND
PLASTIC
LEAD
CHIP
CARRIER
• Power control modes:
– Idle mode
17
– Power-down mode
• CMOS and TTL compatible
18
28
34
• Five speed ranges at V = 5V
CC
– 12MHz
– 16MHz
– 24MHz
– 33MHz
44
1
33
23
PLASTIC
QUAD
FLAT
• Five package styles
PACK
• Extended temperature ranges
• OTP package available
11
12
22
SU00001
SEE PAGE 3 FOR QFP AND LCC PIN FUNCTIONS.
2
1996 Aug 16
853–0169 17187
NXP [ NXP ]
