Product Summary

Port A I/O Pins (PTA6/SS, PTA5/SPSCK, PTA4/KDB4–PTA0/KBD0)

MC68HC908EY16 Product Summary – Rev 1.0

Motorola

Pin Functions

9

5.6 Port A I/O Pins (PTA6/SS, PTA5/SPSCK, PTA4/KDB4–PTA0/KBD0)

Port A input/output (I/O) pins (PTA6/SS, PTA5/SPSCK, PTA4/KDB4,

PTA3/KBD3, PTA2/KBD2, PTA1/KBD1, and PTA0/KBD0) are special-

function, bidirectional I/O port pins. PTA5 and PTA6 are shared with the

serial peripheral interface (SPI). PTA4-PTA0 can be programmed to

serve as keyboard interrupt pins.

5.7 Port B I/O Pins (PTB7/AD7/TBCH1, PTB6/AD6/TBCH0, PTB5/AD5–PTB0/AD0)

PTB7/AD7/TBCH1, PTB6/AD6/TBCH0, and PTB5/AD5–PTB0/AD0 are

special-function, bidirectional I/O port pins that can also be used for ADC

inputs. PTB7/AD7/TBCH1 and PTB6/AD6/TBCH0 are special function

bidirectional I/O port pins that can also be used for timer interface pins.

5.8 Port C I/O Pins (PTC4/OSC1, PTC3/OSC2, PTC2/MCLK, PTC1/MOSI, PTC0/MISO)

PTC4/OSC1–PTC0/MISO are special-function, bidirectional I/O port

pins. PTC3/OSC2 and PTC4/OSC1 are shared with the on-chip

oscillator circuit through configuration options.

When applications require:

•

PTC3/OSC2 can be programmed to be OSC2

•

PTC4/OSC1 can be programmed to be OSC1

PTC2/MCLK is software selectable to be MCLK, or bus clock out.

PTC1/MOSI can be programmed to be the MOSI signal for the SPI.

PTC0/MISO can be programmed to be the MISO signal for the SPI.

5.9 Port D I/O Pins (PTD1/TACH1–PTD0/TACH0)

PTD1/TACH1–PTD0/TACH0 are special-function, bidirectional I/O port

pins that can also be programmed to be timer pins.

Freescale Semiconductor, Inc.

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Go to: www.freescale.com