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8.3
Change of Peripheral Function Pins
For the external sub-clock input and IIC input/output, the multi-function I/O ports can be changed.
The external interrupt can be changed by the setting of ISSR16 and ISSR. I/O ports that also
function as the external sub-clock input pin are changed by the setting of PTCNT0. For IIC
input/output, change the setting of PTCNT1. The pin name of the peripheral function is indicated
by adding 'Ex' at the head of the original pin name. In each peripheral function description, only
the original pin name is used.
The following registers are available as the port control register.
• Port control register 0 (PTCNT0)
• Port control register 1 (PTCNT1)
• Port control register 2 (PTCNT2)
8.3.1
Port Control Register 0 (PTCNT0)
PTCNT0 selects ports that also function as the external sub-clock input pin.
Bit
Bit Name
7 to 1
0
EXCLS
Initial Value
R/W
All 0
R/W
0
R/W
Description
Reserved
The initial value should not be changed.
0: P96/EXCL is selected.
1: PE0/ExEXCL is selected.
Rev. 1.00 May 09, 2008 Page 193 of 954
Section 8 I/O Ports
REJ09B0462-0100
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