User's Manual

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