Datasheet

Input/Output Ports (PORTS)
MC68HC908GR16 Data Sheet, Rev. 5.0
130 Freescale Semiconductor
PTCPUE1 and PTCPUE0 — Port C Input Pullup Enable Bits
These writable bits are software programmable to enable pullup devices on an input port bit.
1 = Corresponding port C pin configured to have internal pullup
0 = Corresponding port C pin internal pullup disconnected
12.5 Port D
Port D is an 8-bit special-function port that shares four of its pins with the serial peripheral interface (SPI)
module and three of its pins with two timer interface (TIM1 and TIM2) modules. Port D also has software
configurable pullup devices if configured as an input port.
12.5.1 Port D Data Register
The port D data register (PTD) contains a data latch for each of the eight port D pins.
PTD7–PTD0 — Port D Data Bits
These read/write bits are software-programmable. Data direction of each port D pin is under the control
of the corresponding bit in data direction register D. Reset has no effect on port D data.
T2CH1 and T2CH0 — Timer 2 Channel I/O Bits
The PTD6/T2CH0–PTD7/T2CH1 pins are the TIM2 input capture/output compare pins. The edge/level
select bits, ELSxB and ELSxA, determine whether the PTD6/T2CH0–PTD7/T2CH1 pins are timer
channel I/O pins or general-purpose I/O pin. See Chapter 18 Timer Interface Module (TIM).
T1CH1 and T1CH0 — Timer 1 Channel I/O Bits
The PTD4/T1CH0–PTD5/T1CH1 pins are the TIM1 input capture/output compare pins. The edge/level
select bits, ELSxB and ELSxA, determine whether the PTD4/T1CH0–PTD5/T1CH1 pins are timer
channel I/O pins or general-purpose I/O pins. See Chapter 18 Timer Interface Module (TIM).
SPSCK — SPI Serial Clock
The PTD3/SPSCK pin is the serial clock input of the SPI module. When the SPE bit is clear, the
PTD3/SPSCK pin is available for general-purpose I/O.
MOSI — Master Out/Slave In
The PTD2/MOSI pin is the master out/slave in terminal of the SPI module. When the SPE bit is clear,
the PTD2/MOSI pin is available for general-purpose I/O.
MISO — Master In/Slave Out
The PTD1/MISO pin is the master in/slave out terminal of the SPI module. When the SPI enable bit,
SPE, is clear, the SPI module is disabled, and the PTD0/SS
pin is available for general-purpose I/O.
Address: $0003
Bit 7654321Bit 0
Read:
PTD7 PTD6 PTD5 PTD4 PTD3 PTD2 PTD1 PTD0
Write:
Reset: Unaffected by reset
Alternative
Function:
T2CH1 T2CH0 T1CH1
T1CH0 SPSCK MOSI MISO SS
Figure 12-13. Port D Data Register (PTD)