MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 166

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Input/Output (I/O) Ports
12.3.3 Port A Input Pullup Enable Register
166
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
Address: $000B
The port A input pullup enable register (PTAPUE) contains a software
configurable pullup device for each if the six port A pins. Each bit is
individually configurable and requires the corresponding data direction
register, DDRAx, to be configured as input. Each pullup device is
automatically and dynamically disabled when its corresponding DDRAx
bit is configured as output.
OSC2EN — Enable PTA4 on OSC2 Pin
PTAPUE[5:0] — Port A Input Pullup Enable Bits
Table 12-1
Reset:
Read:
Write:
This read/write bit configures the OSC2 pin function when internal
oscillator or RC oscillator option is selected. This bit has no effect for
the XTAL or external oscillator options.
These read/write bits are software programmable to enable pullup
devices on port A pins.
Figure 12-5. Port A Input Pullup Enable Register (PTAPUE)
1 = OSC2 pin outputs the internal or RC oscillator clock
0 = OSC2 pin configured for PTA4 I/O, having all the interrupt and
1 = Corresponding port A pin configured to have internal pull if its
0 = Pullup device is disconnected on the corresponding port A pin
OSC2EN
Bit 7
(BUSCLKX4)
pullup functions
DDRA bit is set to 0
regardless of the state of its DDRA bit
0
summarizes the operation of the port A pins.
Input/Output (I/O) Ports
= Unimplemented
6
0
PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE2 PTAPUE0
5
0
4
0
3
0
2
0
1
0
MOTOROLA
Bit 0
0