CHAPTER 12 PORT FUNCTIONS
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User’s Manual U15195EJ5V0UD
12.3.6 Port DH
Port DH is a 6-bit I/O port in which input or output can be specified in 1-bit units.
7
−
PDH
6
−
5
PDH5
4
PDH4
3
PDH3
2
PDH2
1
PDH1
0
PDH0
Address
FFFFF006H
After reset
Undefined
Bit position
Bit name
Function
5 to 0
PDHn
(n = 5 to 0)
I/O port
Besides functioning as a port, in control mode, this can operate as an address bus when memory is expanded
externally.
(1) Operation in control mode
Port
Alternate Pin Name
Remarks
Block Type
Port DH
PDH5 to
PDH0
A21 to A16
Memory expansion address bus
N