MC68HC705P9CS datasheet(88/160 Pages) FREESCALE

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Parallel Input/Output (I/O) Ports

Technical Data

MC68HC705P9 — Rev. 4.0

Parallel Input/Output (I/O) Ports

MOTOROLA

7.5.1 Port C Data Register (PORTC)

The port C data register contains a latch for each of the eight port C pins.

PC[7:0] — Port C Data Bits

These read/write bits are software programmable. Data direction of

each port C pin is under the control of the corresponding bit in data

direction register C. Reset has no effect on port C data.

VRH — Voltage Reference High Bit

When the ADC is turned on, the PC7/VRH pin is the positive ADC

reference voltage.

AN[3:0] — Analog Input Bits

When the ADC is turned on, the AN0–AN3 pins are software-

selectable analog inputs. Unused analog inputs can be used as digital

inputs, but pins PC3/AN3, PC4/AN2, PC5/AN1, and PC6/AN0 cannot

be used as digital outputs while the ADC is on. Only pins PC0, PC1,

and PC2 can be used as digital outputs when the ADC is on.

The port C data register reads normally while the ADC is on, except

that the bit corresponding to the currently selected ADC input pin

reads as logic zero.

Writing to bits PC7–PC3 while the ADC is on can produce

unpredictable ADC results.

$0002

Bit 7

54321

Bit 0

Read:

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

Write:

Reset:

Unaffected by reset

Alternate

Function:

VRH

AN0

AN1

AN2

AN3

Figure 7-8. Port C Data Register (PORTC)

Freescale Semiconductor, Inc.

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