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MSM80C154S/83C154S/85C154HVS
188
Figure 4-85-1/2 MSM80C154S/83C154S battery back up with hard power down mode
RD
WR
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
ALE
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
EA
PSEN
P1
P3
XTAL1
XTAL2
V
CC
VSS
RESET
T1(P3.5)
10PF
1000µF
0.1µF74HC08
74HC02
MSM80C154S/83C154S
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
ALE
P2.0
P2.1
P2.2
P2.6
P2.7
P2.3
P2.4
P2.5
I/O control signal
5.1K
200K
+
–
10µF
74HC02
5.1K
1K
5.1K
74HC08
5
18K
0.1µF
ICL3211
20K 43K
5.1K
34
8
2.2V
VR
+
–
5V
AC100V
1K
RRB51A05W
5.1K
3N-100AAL S
+
–
100µF
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
GND
SN74NS138
G2A
G2B
A
B
C
G1
ACC
SN7408
SN7408
1K
10K
1K
1K
10K
1K
1K
10K
1K
1K
10K
1K
OE
WR
CS0
CS7
VCA
VCB
A
B
C
330