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TMP92CM22
2007-02-16
92CM22-66
3.5.9 Port C (PC0, PC1, PC3, PC5, and PC6)
Port C is 5-bit general-purpose I/O port. Each bit can be set individually for input or
output. Resetting sets port C to input port.
In addition to functioning as a general-purpose I/O port, port C can also function as a
input/output pin (TA0IN, TA1OUT, TA3OUT, and TB0OUT0) and external interrupt pin
(INT0 to INT3).
These settings operate by programming “1” to the corresponding bit of PCCR and PCFC.
Resetting resets the PCCR and PCFC to “0”, and sets all bits to input port.
(1) PC0 (TA0IN)
In addition to function as I/O port, port PC0 can also function as input pin TA0IN of
timer channel 0.
Note: Can not read the output latch data when output mode.
Figure 3.5.18 Port C (PC0)
Internal data bus
Direction control
(on bit basis)
Reset
PCCR write
PC read
PC0 (TA0IN)
PC write
S
Output latch
S
B
Selector
A
Function control
(on bit basis)
PCFC write
TA0IN