s908gz60cfa Freescale Semiconductor, Inc, s908gz60cfa Datasheet - Page 178

• Manufacturer Part Number: s908gz60cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
13.5 Port C
Port C is a 7-bit, general-purpose bidirectional I/O port. Port C also has software configurable pullup
devices if configured as an input port. PTC[1:0] are shared with the MSCAN module.
13.5.1 Port C Data Register
The port C data register (PTC) contains a data latch for each of the seven port C pins.
PTC6–PTC0 — Port C Data Bits
CAN
13.5.2 Data Direction Register C
Data direction register C (DDRC) determines whether each port C pin is an input or an output. Writing a 1
to a DDRC bit enables the output buffer for the corresponding port C pin; a 0 disables the output buffer.
178
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.
The CAN
MSCAN08 control register determines, whether the PTC1/CAN
pins or general-purpose I/O pins. See
RX
and CAN
Alternate Function:
RX
Address:
–CAN
Bit 6 through bit 2 of PTC are not available in the 32-pin LQFP package.
Reset:
Read:
Write:
Address:
TX
Reset:
Read:
Write:
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
— MSCAN08 Bits
TX
$0006
pins are the MSCAN08 modules receive and transmit pins. The CANEN bit in the
Bit 7
0
0
$0002
Bit 7
Figure 13-10. Data Direction Register C (DDRC)
1
= Unimplemented
Figure 13-9. Port C Data Register (PTC)
DDRC6
= Unimplemented
6
0
PTC6
6
DDRC5
Chapter 12 MSCAN08 Controller (MSCAN08).
5
0
PTC5
5
NOTE
DDRC4
4
0
Unaffected by reset
PTC4
4
DDRC3
3
0
PTC3
3
RX
DDRC2
–PTC0/CAN
2
0
PTC2
2
DDRC1
1
0
CAN
PTC1
1
TX
RX
Freescale Semiconductor
pins are MSCAN08
DDRC0
Bit 0
0
CAN
PTC0
Bit 0
TX