p87c453ebaa NXP Semiconductors, p87c453ebaa Datasheet - Page 18

• Manufacturer Part Number: p87c453ebaa
• Description: 80c51 8-bit Microcontroller Family 8k/256 Otp/rom, Expanded I/o
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1998 Apr 23
WRITE TO SBUF
INSTRUCTION
PORT 0
PORT 2
INPUT DATA
OUTPUT DATA
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
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
0
t
t
XLXL
VALID
LLWL
P2.0–P2.7 OR A8–A15 FROM DPH
Figure 11. External Data Memory Write Cycle
t
XHQX
2
Figure 12. Shift Register Mode Timing
1
VALID
t
QVWX
t
XHDX
DATA OUT
3
t
WLWH
2
VALID
18
4
VALID
3
t
WHLH
t
5
WHQX
VALID
4
A0–A7 FROM PCL
A0–A15 FROM PCH
6
VALID
5
83C453/87C453
7
Preliminary specification
VALID
6
INSTR IN
8
SU00008
SET TI
VALID
SET RI
SU00027
7