MC68HC908GR16 Datasheet, PDF (138/310 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Input/Output Ports (PORTS)
12.4.3 Port C Input Pullup Enable Register
The port C input pullup enable register (PTCPUE) contains a software configurable
pullup device for each of the port C pins. Each bit is individually configurable and
requires that the data direction register, DDRC, bit be configured as an input. Each
pullup is automatically and dynamically disabled when a port bit’s DDRC is
configured for output mode.
Address:
Read:
Write:
Reset:
$000E
Bit 7
0
0
6
5
4
3
2
1
Bit 0
PTCPUE6 PTCPUE5 PTCPUE4 PTCPUE3 PTCPUE2 PTCPUE1 PTCPUE0
0
0
0
0
0
0
0
= Unimplemented
Figure 12-12. Port C Input Pullup Enable Register (PTCPUE)
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.
Address:
Read:
Write:
Reset:
Alternate
Function:
$0003
Bit 7
PTD7
T2CH1
6
PTD6
T2CH0
5
PTD5
T1CH1
4
3
PTD4
PTD3
Unaffected by reset
T1CH0 SPSCK
2
PTD2
MOSI
1
PTD1
MISO
Bit 0
PTD0
SS
Figure 12-13. Port D Data Register (PTD)
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.
Data Sheet
138
Input/Output Ports (PORTS)
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Go to: www.freescale.com
MC68HC908GR16 — Rev. 1.0
MOTOROLA