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MSM80C154S/83C154S/85C154HVS
168
Figure 4-68 Hard power down mode setting andl/Of loating 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
PORT 2
PORT 3
PCON-bit 6
1
0
HARD POWER DOWN MODE
S6
HPD SET CYCLE
1
0
1
0
IOCON-bit 0
*ALF=“1”
S1
*HPDI [P3.5]
1
0
1
0
1
0
1
0
PORT DATA
PORT DATA
FLOATING
FLOATING
FLOATING
FLOATING
PCLPCL PCL
PCH PCHPCH
PORT DATA
1
0