MC68HC908KX8 Datasheet, PDF (154/310 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
10.3.3 Port A Input Pullup Enable Register
The port A input pullup enable register (PTAPUE) contains a software
configurable pullup device for each of the five 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
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
PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-5. Port A Input Pullup Enable Register (PTAPUE)
PTAPUE4–PTAPUE0 — Port A Input Pullup Enable Bits
These writable 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
10.4 Port B
Port B is an 8-bit special-function port that shares four of its pins with the
analog-to-digital converter module (ADC), two with the serial
communication interface module (SCI) and two with an optional external
clock source.
Technical Data
154
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Input/Output (I/O) Ports
MOTOROLA