MC68HC912B32MFU8 MOTOROLA [Motorola, Inc], MC68HC912B32MFU8 Datasheet - Page 36

• Manufacturer Part Number: MC68HC912B32MFU8
• Description: 16-Bit Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

PUCR — Pull-Up Control Register
PUPE — Pull-Up Port E Enable
PUPB — Pull-Up Port B Enable
PUPA — Pull-Up Port A Enable
RDRIV — Reduced Drive of I/O Lines
RDPE — Reduced Drive of Port E
RDPB — Reduced Drive of Port B
RDPA — Reduced Drive of Port A
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MOTOROLA
RESET:
RESET:
These bits select pull-up resistors for any pin in the corresponding port that is currently configured as
an input. This register is not in the map in peripheral mode.
Read and write anytime.
Pin PE1 always has a pull-up. Pins PE6, PE5, and PE4 never have pull-ups.
This bit has no effect if port B is being used as part of the address/data bus (the pull-ups are inactive).
This bit has no effect if port A is being used as part of the address/data bus (the pull-ups are inactive).
These bits select reduced drive for the associated port pins. This gives reduced power consumption and
reduced RFI with a slight increase in transition time (depending on loading). The reduced drive function
is independent of which function is being used on a particular port. This register is not in the map in
peripheral mode.
Normal: write once; Special: write anytime except the first time. Read anytime.
0 = Port E pull-ups on PE7, PE3, PE2, and PE0 are disabled.
1 = Enable pull-up devices for port E input pins PE7, PE3, PE2, and PE0.
0 = Port B pull-ups are disabled.
1 = Enable pull-up devices for all port B input pins.
0 = Port A pull-ups are disabled.
1 = Enable pull-up devices for all port A input pins.
0 = All port E output pins have full drive enabled.
1 = All port E output pins have reduced drive capability.
0 = All port B output pins have full drive enabled.
1 = All port B output pins have reduced drive capability.
0 = All port A output pins have full drive enabled.
1 = All port A output pins have reduced drive capability.
Bit 7
Bit 7
0
0
0
0
6
0
0
6
0
0
5
0
0
5
0
0
PUPE
4
1
4
0
0
RDPE
3
0
0
3
0
2
0
0
2
0
0
RDPB
PUPB
1
0
1
0
MC68HC912B32TS/D
RDPA
PUPA
Bit 0
Bit 0
MC68HC912B32
0
0
$000C
$000D