AN1746 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

AN1746

Migrating from the MC68HC705K1 to the MC68HC705KJ1

Freescale Semiconductor 

Application Note

Freescale Semiconductor, Inc.

$0001 Bit 7

6

5

4

3

2

1

Bit 0

Read: 0

Write:

0

See

Note

See

Note

PB3

PB2

See

See

Note Note

Reset:

Unaffected by reset

= Unimplemented

PB5, PB4, PB1, and PB0 should be configured as inputs at all times. These bits are avail-

able for read/write but are not available externally. Configuring them as inputs will en-

sure that the pulldown devices are enabled, thus properly terminating them.

Figure 7. Port B Data Register (PORTB)

$0005 Bit 7

6

5

4

3

2

1

Bit 0

Read: 0

Write:

0

See

Note

See

Note

DDRB3 DDRB2

See

Note

See

Note

Reset: 0

0

0

0

0

0

0

0

= Unimplemented

PB5, PB4, PB1, and PB0 should be configured as inputs at all times. These bits are avail-

able for read/write but are not available externally. Configuring them as inputs will en-

sure that the pulldown devices are enabled, thus properly terminating them.

Figure 8. Port B Data Direction Register (DDRB)

$0011 Bit 7

6

5

4

3

2

1

Bit 0

Read: 0

Write:

0

See

Note

See

Note

PDIB3 PDIB2

See

Note

See

Note

Reset: 0

0

0

0

0

0

0

0

= Unimplemented

PB5, PB4, PB1, and PB0 should be configured as inputs at all times. These bits are avail-

able for read/write but are not available externally. Configuring them as inputs will en-

sure that the pulldown devices are enabled, thus properly terminating them.

Figure 9. Pulldown Register B (PDRB)

For More Information On This Product,

Go to: www.freescale.com

AN1746

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