mc68hc912bd32 Freescale Semiconductor, Inc, mc68hc912bd32 Datasheet - Page 169

• Manufacturer Part Number: mc68hc912bd32
• Description: 16-bit Device Composed Of Standard On-chip Peripherals
• Manufacturer: Freescale Semiconductor, Inc

PURDS — Pullup and Reduced Drive for Port S
23-sint
RESET:
Bit 7
0
0
RDPS2
6
0
DDS0 — Data Direction for Port S, Bit 0
DDS1 — Data Direction for Port S, Bit 1
DDS[2:3] — Data Direction for Port S Bit 2 and Bit 3
DDS[6:4] — Data Direction for Port S Bits 6 through 4
DDS7 — Data Direction for Port S Bit 7
Read or write anytime.
RDPS2 — Reduce Drive of PS[7:4]
If the SCI receiver is configured for two-wire SCI operation,
corresponding port S pins will be input regardless of the state of these
bits.
If the SCI transmitter is configured for two-wire SCI operation,
corresponding port S pins will be output regardless of the state of
these bits.
These bits are for general purpose I/O only.
If the SPI is enabled and expects the corresponding port S pin to be
an input, it will be an input regardless of the state of the DDRS bit. If
the SPI is enabled and expects the bit to be an output, it will be an
output only if the DDRS bit is set.
In SPI slave mode, DDS7 has no meaning or effect; the PS7 pin is
dedicated as the SS input. In SPI master mode, DDS7 determines
whether PS7 is an error detect input to the SPI or a general-purpose
or slave select output line.
Freescale Semiconductor, Inc.
For More Information On This Product,
0 = Port S output drivers for bits 7 through 4 operate normally.
1 = Port S output pins for bits 7 through 4 have reduced drive
RDPS1
5
0
capability for lower power and less noise.
Go to: www.freescale.com
RDPS0
Serial Interface
4
0
3
0
0
PUPS2
2
0
PUPS1
1
0
MC68HC912BD32 Rev 1.0
PUPS0
Bit 0
0
Serial Interface
$00DB
Port S