Toshiba H1 Series Data Book page 138

3.7.9 Port C (PC0 to PC7)
PC0 to PC7 are 8-bit general-purpose I/O port. Each bit can be set individually for input
or output. Resetting sets Port C to an input port. It also sets all bits of the output latch
register to "1".
In addition to functioning as a general-purpose I/O port, Port C can also function as
input pin for timers (TA0IN, TA2IN), input pin for external interruption (INT0 to INT3),
Extension address function (EA26, EA27, EA28) and output pin for Key (KO8). Above
setting is used the function register PCFC. Edge select of external interruption establishes
it with IIMC register, which there is in interruption controller.
(1) PC0 (INT0), PC2 (INT2)
Reset
Direction control
PCCR write
Function control
PCFC write
S
Output latch
PCwrite
Selector
PC read
INT0
INT2
Figure 3.7.20 Port C0, C2
92CZ26A-135
S
B
A
Level/edge selection
and
Rising/Falling selection
IIMC<I0LE, I0EDGE>
<I2LE, I2EDGE>
TMP92CZ26A
PC0 (INT0)
PC2(INT2)