Datasheet

Input/Output Ports (I/O)
Technical Data MC68HC908GR8 — Rev 4.0
212 Input/Output Ports (I/O) MOTOROLA
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.
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
Address: $000D
Bit 7654321Bit 0
Read: 0000
PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Write:
Reset:00000000
Figure 16-5. Port A Input Pullup Enable Register (PTAPUE)
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cale Semiconductor,
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