Philips Semiconductors
Product specification
Single-chip 8-bit microcontroller
80C552/83C552
ALE
t
WHLH
PSEN
t
t
WLWH
LLWL
WR
t
t
t
LLAX
WHQX
t
AVLL
QVWX
t
DW
A0–A7
FROM RI OR DPL
PORT 0
PORT 2
DATA OUT
A0–A7 FROM PCL
INSTR IN
t
AVWL
P2.0–P2.7 OR A8–A15 FROM DPH
A8–A15 FROM PCH
Figure 4. External Data Memory Write Cycle
t
r
t
f
t
HIGH
V
0.8V
V
IH1
0.8V
V
0.8V
V
IH1
0.8V
IH1
IH1
t
LOW
t
CLCL
Figure 5. External Clock Drive XTAL1
INSTRUCTION
ALE
0
1
2
3
4
5
6
7
8
t
XLXL
CLOCK
t
XHQX
t
QVXH
OUTPUT DATA
0
1
2
3
4
5
6
7
WRITE TO SBUF
t
t
XHDX
XHDV
SET TI
VALID
INPUT DATA
CLEAR RI
VALID
VALID
VALID
VALID
VALID
VALID
VALID
SET RI
Figure 6. Shift Register Mode Timing
17
1998 Aug 13
NXP [ NXP ]
