P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 15

• Manufacturer Part Number: P87C52
• Description: 80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
1999 Jul 23
WRITE TO SBUF
INSTRUCTION
PORT 0
PORT 2
INPUT DATA
OUTPUT DATA
80C51 8-bit microcontrollers
16K/32K, 512 OTP, I
CLEAR RI
PSEN
ALE
WR
CLOCK
ALE
t
AVLL
0
t
QVXH
FROM RI OR DPL
A0–A7
t
t
1
XHDV
LLAX
t
AVWL
2
0
t
t
XLXL
VALID
C, watchdog timer
LLWL
P2.0–P2.7 OR A8–A15 FROM DPF
Figure 3. External Data Memory Write Cycle
t
XHQX
2
Figure 4. Shift Register Mode Timing
1
VALID
t
QVWX
t
XHDX
DATA OUT
3
t
WLWH
2
VALID
15
4
VALID
3
t
WHLH
t
5
WHQX
VALID
4
A0–A7 FROM PCL
A0–A15 FROM PCH
6
VALID
5
87C524/87C528
7
VALID
6
Product specification
INSTR IN
8
SU00069
SET TI
VALID
SET RI
SU00027
7