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CHAPTER 12 PORT FUNCTIONS
User’s Manual U12688EJ4V0UM00
391
12.3.10 Port 9
Port 9 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Address
FFFFF012H
7
P97
P9
6
P96
5
P95
4
P94
3
P93
2
P92
1
P91
0
P90
After reset
Undefined
Bit Position
Bit Name
Function
7 to 0
P9n (n = 7 to 0)
Port 9
Input/output port
In addition to their function as port pins, the port 9 pins can also operate in the control mode (external expansion
mode) as control signal outputs and bus hold control signal output used when memory is expanded externally.
(1) Operation in control mode
Port
Control Mode
Remark
Block Type
P90
LWR/LCAS
P91
UWR/UCAS
P92
RD
P93
WE
P94
BCYST
P95
OE
Control signal output in memory
expansion
P96
HLDAK
Bus hold acknowledge signal output
O
Port 9
P97
HLDRQ
Bus hold request signal input
H
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