MC68HC908MR8 Datasheet, PDF (287/372 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
Port C
NOTE:
Port C bit 1 is not used on the 28-pin packages. For that reason, a
pull-down resistor is connected to V_SS to prevent a false fault input on
FAULT4.
PORTC has the capability of being used as an output port. When either
pin of PORTC is set as an output, by setting its respective PORTC data
direction register bit, the respective fault pin logic is disconnected from
that pin and the fault input will be defaulted to normal non-fault condition
to facilitate the use of PORTC as an output pin and not interfere with the
PWM generator. To regain the fault capability for the respective fault
input pin, clear the PORTC data direction register bit for that pin.
14.5.1 Port C Data Register
The port C data register (PTC) contains a data latch for each of the two
port C pins.
Ad-
dress:
$0002
Bit 7
6
5
4
3
2
1
Read:
Write:
PTC1
Reset:
Unaffected by reset
= Unimplemented
Figure 14-8. Port C Data Register (PTC)
Bit 0
PTC0
PTC[1:0] — 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.
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Input/Output (I/O) Ports
Technical Data
287