HC705JJ7GRSSLASHD datasheet(99/230 Pages) NXP

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Parallel Input/Output

Port C (28-Pin Versions Only)

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

General Release Specification

Parallel Input/Output

7.5 Port C (28-Pin Versions Only)

Port C is a 8-bit, general-purpose bidirectional I/O port with these

features:

•

Individual programmable pulldown devices

•

High current sinking capability on all port C pins, with a maximum

total for port C

•

High current sourcing capability on all port C pins, with a maximum

total for port C

7.5.1 Port C Data Register (PORTC)

The port C data register contains a bit for each of the port C pins. When

a port C pin is programmed to be an output, the state of its data register

bit determines the state of the output pin. When a port C pin is

programmed to be an input, reading the port C data register returns the

logic state of the pin.

PC7–PC0 — Port C Data Bits

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

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

direction register (DDRC). Reset has no effect on port C data.

$0002

Bit 7

654321

Bit 0

Read:

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

Write:

Reset:

Unaffected by Reset

Figure 7-13. Port C Data Register (PORTC)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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