p80c550efaa NXP Semiconductors, p80c550efaa Datasheet - Page 19

• Manufacturer Part Number: p80c550efaa
• Description: 80c51 8-bit Microcontroller Family 4k/128 Otp/rom/romless, Channel Watchdog Timer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1998 May 01
WRITE TO SBUF
INSTRUCTION
PORT 0
PORT 2
INPUT DATA
OUTPUT DATA
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer
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
V
CC
0.45V
–0.5
P2.0–P2.7 OR A8–A15 FROM DPF
Figure 7. External Data Memory Write Cycle
t
XHQX
2
Figure 8. Shift Register Mode Timing
1
VALID
t
QVWX
Figure 9. External Clock Drive
0.2V
t
CHCL
0.7V
t
CC
XHDX
DATA OUT
CC
3
t
WLWH
–0.1
2
VALID
19
t
CLCX
4
t
CLCL
VALID
3
t
CHCX
t
CLCH
t
WHLH
t
5
WHQX
SU00009
VALID
4
80C550/83C550/87C550
A0–A7 FROM PCL
A0–A15 FROM PCH
6
VALID
5
7
VALID
6
Product specification
INSTR IN
8
SU00069
SET TI
VALID
SET RI
SU00027
7