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7.11.4
Pin Functions
When the corresponding bit in PTCNT2 is set to 1, port A pins can be used as TPU I/O pins
(ExTIOCA1 and ExTIOCC0/ExTCLKA). The relationship between register setting values and pin
functions is as follows.
• PA7/CS3/ExTIOCA1
When the TIOCA1S bit in PTCNT2 is set to 1, this pin can be used as the ExTIOCA1 pin.
According to operating modes, the TPU channel 1 settings by the CS3E bit in PFCR, the MD3
to MD0 bits in TMDR_1, the IOA3 to IOA0 bits in TIOR_1, and the CCLR1 and CCLR0 bits
in TCR_1, and the combination of the TIOCA1S bit and the PA7DDR bit, the pin function is
switched as shown below.
• Extended Mode (EXPE = 1)
CS3E
TIOCA1S
TPU channel 1 setting
PA7DDR
Pin function
• Single-Chip Mode (EXPE = 0)
TIOCA1S
TPU channel 1 setting
PA7DDR
Pin function
Rev. 1.00, 09/03, page 200 of 704
0
Single-chip
0
operation
CS3 output pin
0
0
1
PA7 input
PA7 output
pin
pin
1
Table below (2)
CS3 output pin
ExTIOCA1 input pin*
Table below (2)
0
1
PA7 input
PA7 output
pin
pin
ExTIOCA1 input pin*
1
Table below (1)
CS3 output pin
1
1
Table below (1)
ExTIOCA1 output
pin
1
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