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MSM80C154S/83C154S/85C154HVS
160
Figure 4-63 Soft power down mode setting and I/O floating time chart (external ROM mode)
S1 S2 S3 S4 S5 S6
M1 or M2 M1
XTAL1
1
0
ALE
1
0
PSEN
PORT 0
PORT 1
1
0
PORT 2
1
0
PORT 3
1
0
W-PCON
1
0
*PCON-bit 1
1
0
SOFT POWER DOWN MODE
S6
PORT DATA
PORT DATA
PD SET CYCLE
1
0
1
0
IOCON-bit 0
*ALF=“1”
S1
FLOATING
FLOATING
FLOATING
FLOATING
PCLPCL PCL
PCH PCHPCH
PORT DATA
1
0