Z8
®
CPU
User Manual
UM001604-0108 Input/Output Ports
67
Because the types and amounts of I/O vary greatly among the Z8
®
CPU family devices, it is
recommended to review the selected device's product specifications for the register default
state after reset.
Figure 54. Port 0/1 Reset
Figure 55. Port 2 Reset
Note:
0 1 0 0 1 1 0 1
(Write-Only)
01 = Input
1X = A8–A11
Stack Selection
0 = External
P00–P03 Mode
00 = Output
Port 0–1 Mode Register (P01M)
Register F8h
01 = Byte Output
1 = Internal
External Memory Timing
Normal = 0
Extended = 1
P04–P07 Mode
Output = 00
Input = 01
A12–A15 = 1X
10 = AD0–AD7
00 = Byte Output
P10–P17 Mode
A8–A15, AS
, DS, R/W
11 = High Impedance AD0–AD7,
1 1 1 1 1 1 1 1
(Write-Only)
1 = Input
Port 2 Mode
0 = Output
Port 2 Mode Register (P2M)
Register F6h
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