80CL31 Datasheet, PDF (32/40 Pages) NXP Semiconductors – Low-voltage single-chip 8-bit microcontrollers

Philips Semiconductors
Low-voltage single-chip 8-bit microcontrollers
Product specification
80CL31/80CL51
DOTTED LINES
ARE VALID WHEN
RD OR WR
ARE ACTIVE
ONLY ACTIVE
DURING A READ
FROM EXTERNAL
DATA MEMORY
ONLY ACTIVE
DURING A WRITE
TO EXTERNAL
DATA MEMORY
ONE MACHINE CYCLE
ONE MACHINE CYCLE
XTAL1
INPUT
S1
S2
S3
S4
S5
S6
P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2
S1
S2
S3
S4
S5
S6
P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2
ALE
PSEN
RD
WR
EXTERNAL
PROGRAM
MEMORY
FETCH
BUS
(PORT 0)
INST
IN
ADDRESS
A0-A7
INST
IN
ADDRESS
A0-A7
INST
IN
ADDRESS
A0-A7
INST
IN
ADDRESS
A0-A7
PORT 2
ADDRESS A8-A15
ADDRESS A8-A15
ADDRESS A8-A15
ADDRESS A8-A15
READ OR WRITE
OF EXTERNAL
DATA MEMORY
BUS
(PORT 0)
INST
IN
ADDRESS
A0-A7
INST
IN
ADDRESS
A0-A7
DATA OUTPUT OR DATA INPUT
PORT 2
ADDRESS A8-A15
ADDRESS A8-A15 OR PORT 2 OUT
ADDRESS
A0-A7
ADDRESS A8-A15
PORT 0,2,3
OUTPUT
OLD DATA
NEW DATA
PORT 1
OUTPUT
OLD DATA
NEW DATA
PORT 0,2,3
OUTPUT
PORT 1
OUTPUT
SERIAL
PORT
CLOCK
SAMPLING TIME OF I/O PORT PINS DURING INPUT
January 1995
Figure 23. Instruction Cycle Timing
32