CHAPTER 12 PORT FUNCTIONS
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User’s Manual U15195EJ5V0UD
12.3.9 Port CM
Port CM is a 2-bit I/O port in which input or output can be specified in 1-bit units.
7
−
PCM
6
−
5
−
4
−
3
−
2
−
1
PCM1
0
PCM0
Address
FFFFF00CH
After reset
Undefined
Bit position
Bit name
Function
1, 0
PCMn
(n = 1, 0)
I/O port
Besides functioning as a port, in control mode, this can operate as the wait insertion signal input and internal
system clock output.
(1) Operation in control mode
Port
Alternate Pin Name
Remarks
Block Type
PCM0 WAIT
Note
Wait insertion signal input
D
Port CM
PCM1
CLKOUT
Internal system clock output
I
Note
In the ROMless mode, the default operation mode of the PCM0 pin is the WAIT input mode. When unused, fix
the pin to the inactive level. When used as a port, this pin functions in the control mode until the port mode is
set using the port CM mode control register (PMCCM). Set this pin to the inactive level during this period.