80CL31 Datasheet, PDF (5/40 Pages) NXP Semiconductors – Low-voltage single-chip 8-bit microcontrollers

Philips Semiconductors
Low-voltage single-chip 8-bit microcontrollers
Product specification
80CL31/80CL51
BLOCK DIAGRAM
FREQUENNCY REFERENCE
XTAL2 XTAL1
COUNTER¹
T0
T1
OSCILLATOR
AND TIMING
PROGRAM
MEMORY
(4K BY 8 ROM)
DATA MEMORY
(128 BY 8 RAM)
TWO 16-BIT TIMER/
EVENT COUNTERS
80CL51
CPU
10
3
64K BYTE BUS
EXPANSION
CONTROL
INTERNAL
INTERRUPTS
PROGRAMMABLE
I/O
PROGRAMMABLE
SERIAL PORT,
FULL DUPLEX UART,
SYNCHRONOUS
SHIFT
EXTERNAL ENTERRUPTS¹
1. Pins shared with parallels ports pins.
FUNCTIONAL DIAGRAM
CONTROL
PARALLEL PORTS
ADDRESS/DATA BUS
I/O PINS
RXD TXD
(1)
V_DD
V_SS
RST
XTAL1
XTAL2
PORT 0
ADDRESS AND
DATA BUS
January 1995
ALTERNATIVE
FUNCTIONS
RxD/data
TxD/clock
INT0
INT1
T0
T1
WR
RD
EA
PSEN
ALE
PORT 3
PORT 1
INT2/INT9
PORT 2
ADDRESS BUS
5