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P80C851FBA 데이터 시트보기 (PDF) - Philips Electronics
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P80C851FBA
CMOS single-chip 8-bit microcontroller with on-chip EEPROM
Philips Electronics
P80C851FBA Datasheet PDF : 22 Pages
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Philips Semiconductors
CMOS single-chip 8-bit microcontroller
with on-chip EEPROM
Product specification
80C851/83C851
ALE
PSEN
WR
PORT 0
PORT 2
t
WHLH
t
LLWL
t
AVLL
t
AW
t
LLAX
A0–A7
FROM RI OR DPL
t
AVWL
t
WLWH
t
QVWX
t
QVWH
DATA OUT
t
WHQX
A0–A7 FROM PCL
P2.0–P2.7 OR A8–A15 FROM DPH
A8–A15 FROM PCH
Figure 6. External Data Memory Write Cycle
INSTR IN
XTAL1
INPUT
ALE
PSEN
S1
P1 P2
S2
P1 P2
ONE MACHINE CYCLE
S3
S4
P1 P2 P1 P2
S5
P1 P2
S6
S1
P1 P2 P1 P2
S2
P1 P2
ONE MACHINE CYCLE
S3
S4
S5
P1 P2 P1 P2 P1 P2
S6
P1 P2
RD
WR
EXTERNAL
PROGRAM
MEMORY
FETCH
BUS
PORT 0
DATA
ADDRESS
FLOAT
PORT 2
(EXTERNAL)
FLOAT
DATA
ADDRESS
FLOAT
FLOAT
DATA
ADDRESS
FLOAT
ADDRESS TRANSITIONS
FLOAT
DATA
ADDRESS
FLOAT
FLOAT
PORT
OUTPUT
OLD DATA
NEW DATA
PORT
INPUT
SERIAL
PORT
(SHIFT CLOCK)
SAMPLING TIME OF I/O PORT PINS DURING INPUT (INCLUDING INT0 AND INT1)
Figure 7. Instruction Timing
1998 Jul 03
15
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