P87C51RA2 Philips Semiconductors, P87C51RA2 Datasheet - Page 51

• Manufacturer Part Number: P87C51RA2
• Description: 80C51 8-bit microcontroller family
• Manufacturer: Philips Semiconductors

Philips Semiconductors
2003 Jan 24
WRITE TO SBUF
INSTRUCTION
PORT 0
PORT 2
INPUT DATA
OUTPUT DATA
80C51 8-bit microcontroller family
with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high
speed (30/33 MHz)
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
8KB/16KB/32KB/64KB OTP
–0.5
P2.0–P2.7 OR A8–A15 FROM DPF
Figure 36. External Data Memory Write Cycle
t
XHQX
2
Figure 37. Shift Register Mode Timing
VALID
1
t
QVWX
Figure 38. External Clock Drive
0.2V
t
CHCL
0.7V
t
CC
t
XHDX
DATA OUT
QVWH
CC
3
t
WLWH
–0.1
VALID
2
51
t
CLCX
4
t
CLCL
VALID
3
t
CHCX
t
CLCH
t
WHLH
t
5
WHQX
P87C51RA2/RB2/RC2/RD2
VALID
SU00009
4
A0–A7 FROM PCL
A0–A15 FROM PCH
6
VALID
5
7
VALID
6
INSTR IN
Product data
8
VALID
SU00026
SET TI
SET RI
SU00027
7