MC68HC08AS20 Datasheet, PDF (186/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

15.5 Port C
Port C is an 5-bit general-purpose bidirectional I/O port that shares one
of its pins with the bus clock (MCLK).
15.5.1 Port C Data Register
The port C data register contains a data latch for each of the five port C
pins.
Address: $0002
Bit 7
6
5
4
3
2
1
Read: 0
0
0
PTC4 PTC3 PTC2 PTC1
Write:
Reset:
Unaffected by Reset
Alternate
Functions:
MCLK
= Unimplemented
Figure 15-7. Port C Data Register (PTC)
Bit 0
PTC0
PTC[4:0] — Port C Data Bits
These read/write bits are software-programmable. Data direction of
each port C pin is under the control of the corresponding bit in data
direction register C. Reset has no effect on port C data.
MCLK — T12 System Bus Clock Bit
The bus clock (MCLK) is driven out of PTC2 when enabled by the
MCLKEN bit in PTCDDR7.
Advance Information
186
MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor