MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 47
MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Port S
Port T
21-pins
MOTOROLA
When the PUPP bit in the PWCTL register is set, all input pins are pulled
up internally by an active pull-up device. Pullups are disabled after reset.
Setting the RDPP bit in the PWCTL register configures all port P outputs
to have reduced drive levels. Levels are at normal drive capability after
reset. The PWCTL register can be read or written anytime after reset.
Refer to
Port S is the 8-bit interface to the standard serial interface consisting of
the two serial communications interfaces (SCI1 and SCI0) and the serial
peripheral interface (SPI) subsystems. Port S pins are available for
general-purpose I/O when standard serial functions are not enabled.
Port S pins serve several functions depending on the various internal
control registers. If WOMS bit in the SC0CR1register is set, the
P-channel drivers of the output buffers are disabled (wire-or mode) for
pins 0 through 3. If SWOM bit in the SP0CR1 register is set, the
P-channel drivers of the output buffers are disabled (wire-or mode) for
pins 4 through 7. The open drain control affects both the serial and the
general-purpose outputs. If the RDPS bit in the SP0CR2 register is set,
Port S pin drive capabilities are reduced. If PUPS bit in the SP0CR2
register is set, a pull-up device is activated for each port S pin
programmed as a general purpose input. If the pin is programmed as a
general-purpose output, the pull-up is disconnected from the pin
regardless of the state of PUPS bit. See
This port provides eight general-purpose I/O pins when not enabled for
input capture and output compare in the timer and pulse accumulator
subsystem. The TEN bit in the TSCR register enables the timer function.
The pulse accumulator subsystem is enabled with the PAEN bit in the
PACTL register.
Register DDRT determines pin direction of port T when used for
general-purpose I/O. When DDRT bits are set, the corresponding pin is
configured for output. On reset the DDRT bits are cleared and the
corresponding pin is configured for input.
Pulse-Width
Pinout and Signal Descriptions
Modulator.
Multiple Serial
Pinout and Signal Descriptions
MC68HC912DT128A Rev 2.0
Interface.
Port Signals
47
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