Philips Semiconductors
Product data
Single-chip 8-bit microcontroller with 10-bit A/D,
capture/compare timer, high-speed outputs, PWM
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
SU01696
Figure 4. External Data Memory Write Cycle
t
r
t
f
t
HIGH
V
0.8 V
V
IH1
0.8 V
V
0.8 V
V
IH1
0.8 V
IH1
IH1
t
LOW
t
SU01697
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
SU01678
Figure 6. Shift Register Mode Timing
17
2002 Sep 03
NXP [ NXP ]
