Datasheet

Bus Control and Input/Output
Registers
MC9S12DP256 — Revision 1.1
Bus Control and Input/Output
This register is used to select pullup resistors for the pins associated
with the A, B, E, K ports. Pullups are assigned on a per-port basis and
apply to any pin in the corresponding port that is currently configured
as an input.
This register is not in the on-chip map in emulation and peripheral
modes.
Read and write: anytime (provided this register is in the map).
PUPKE — Pull-Up Port K Enable
0 = Port K pull-ups are disabled.
1 = Enable pull-up devices for port K input pins.
PUPEE — Pull-Up Port E Enable
0 = Port E pull-ups on bit 7, 4–0 are disabled.
1 = Enable pull-up devices for port E input pin bits 7, 4–0.
PUPBE — Pull-Up Port B Enable
0 = Port B pull-ups are disabled.
1 = Enable pull-up devices for all port B input pins.
PUPAE — Pull-Up Port A Enable
0 = Port A pull-ups are disabled.
1 = Enable pull-up devices for all port A input pins.
PUCR — Pull-Up Control Register
Address Offset: $000C
Bit 7 654321Bit 0
PUPKE 0 0 PUPEE 0 0 PUPBE PUPAE
Reset: 10010000
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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