Datasheet

Inter IC Bus
IIC Register Descriptions
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA Inter IC Bus 317
Read and write anytime
RDPIB - Reduced Drive of Port IB
0 = All port IB output pins have full drive enabled.
1 = All port IB output pins have reduced drive capability.
PUPIB - Pull-Up Port IB Enable
0 = Port IB pull-ups are disabled.
1 = Enable pull-up devices for port IB input pins [7:6]. Pull-ups for
port IB input pins [5:0] are always enabled.
Read and write anytime.
IIC functions SCL and SDA share port IB pins 7 and 6 and take
precedence over the general-purpose port when IIC is enabled. The
SCL and SDA output buffers behave as open-drain outputs.
When port is configured as input, a read will return the pin level. Port bits
5 through 0 have internal pull ups when configured as inputs so they will
read ones.
When configured as output, a read will return the latched output data.
Port bits 5 through 0 will read the last value written. A write will drive
associated pins only if configured for output and IIC is not enabled.
Port bits 5 through 0 do not have available external pins for
MC68HC912DT128A.
IBPURD — Pull-Up and Reduced Drive for Port IB $00E5
Bit 7654321Bit 0
000RDPIB000PUPIB
RESET:00000000
PORTIB — Port Data IB Register $00E6
Bit 7654321Bit 0
PIB7 PIB6 PIB5 PIB4 PIB3 PIB2 PIB1 PIB0
IICSCLSDA------
RESET:--------
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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