XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 223

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

14.4.3 Pullup and Reduced Drive Register for Port S
M68HC12B Family — Rev. 8.0
MOTOROLA
Read: Anytime
Write: Anytime
RDPS2 — Reduce Drive of PS7–PS4
RDPS1 — Reduce Drive of PS3 and PS2
RDPS0 — Reduce Drive of PS1 and PS0
PUPS2 — Pullup Port S Enable PS7–PS4
PUPS1 — Pullup Port S Enable PS3 and PS2 Bit
PUPS0 — Pullup Port S Enable PS1 and PS0 Bit
Figure 14-22. Pullup and Reduced Drive Register for Port S (PURDS)
Address:
Reset:
Read:
Write:
0 = Port S output drivers for bits 7–4 operate normally.
1 = Port S output pins for bits 7–4 have reduced drive capability for lower
0 = Port S output drivers for bits 3 and 2 operate normally.
1 = Port S output pins for bits 3 and 2 have reduced drive capability for lower
0 = Port S output drivers for bits 1 and 0 operate normally.
1 = Port S output pins for bits 1 and 0 have reduced drive capability for lower
0 = No internal pullups on port S bits 7–4.
1 = Port S input pins for bits 7–4 have an active pullup device. If a pin is
0 = No internal pullups on port S bits 3 and 2
1 = Port S input pins for bits 3 and 2 have an active pullup device. If a pin is
0 = No internal pullups on port S bits 1 and 0
1 = Port S input pins for bits 1 and 0 have an active pullup device. If a pin is
power and less noise.
power and less noise.
power and less noise.
programmed as output, the pullup device becomes inactive.
programmed as output, the pullup device becomes inactive.
programmed as output, the pullup device becomes inactive.
$00DB
Bit 7
0
0
= Unimplemented
RDPS2
6
0
Serial Interface
RDPS1
5
0
RDPS0
4
0
3
0
0
PUPS2
2
0
PUPS1
Serial Interface
1
0
Data Sheet
PUPS0
Bit 0
Port S
0
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