68HC908GR Datasheet, PDF (212/408 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Input/Output Ports (I/O)
16.3.3 Port A Input Pullup Enable Register
The port A input pullup enable register (PTAPUE) contains a software
configurable pullup device for each of the four port A pins. Each bit is
individually configurable and requires that the data direction register,
DDRA, bit be configured as an input. Each pullup is automatically and
dynamically disabled when a port bit’s DDRA is configured for output
mode.
Address: $000D
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 16-5. Port A Input Pullup Enable Register (PTAPUE)
PTAPUE3–PTAPUE0 — Port A Input Pullup Enable Bits
These writeable bits are software programmable to enable pullup
devices on an input port bit.
1 = Corresponding port A pin configured to have internal pullup
0 = Corresponding port A pin has internal pullup disconnected
Technical Data
212
MC68HC908GR8 — Rev 4.0
Input/Output Ports (I/O)
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