Renesas H8S/2100 Series, Hardware Manual

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Section 7 I/O Ports
Rev. 1.00 Apr. 28, 2008 Page 194 of 994
REJ09B0452-0100
7.3 Change of Peripheral Function Pins
For the external sub-clock input and IIC input/output, the multi-function I/O ports can be changed.
I/O ports that also function as the external interrupt pins are 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, 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)
7.3.1 Port Control Register 0 (PTCNT0)
PTCNT0 selects ports that also function as the external sub-clock input pin.
Bit Bit Name Initial Value R/W Description
7 to 1

All 0 R/W Reserved
The initial value should not be changed.
0 EXCLS 0 R/W 0: P96/EXCL is selected
1: PH0/ExEXCL is selected