68HC05PL4 datasheet(47/98 Pages) FREESCALE

47 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

INPUT/OUTPUT PORTS

REV 2.0

7-3

7.3

PORT B

Port B is an 8-bit bidirectional port, with pins PB0-PB3 shared with keyboard inter-

rupt functions. The Port B Data Register is at address $0001 and the Data Direc-

tion Register is at address $0006.

Pins PB0 to PB3 keyboard interrupt functions have individual enable and ag bits

in registers $000B and $000C.

7.4

PORT C

Port C is an 8-bit bidirectional port. The Port C Data Register is at address $0002

and the Data Direction Register is at address $0007. Port pins PC0 to PC3 are

high current sink pins; see Electrical Speci cations section f or values.

7.5

SUMMARY OF PORT A AND PORT B SHARED PINS

Table 7-2

below shows a summary of port pins shared with other on-chip mod-

ules.

Table 7-2. Port A and Port B Shared Pins

Port

Port Pin

Control

Pin Name

Shared Functions

Port A

PA0

—

PA0 or OSC2

PA0 on MC68HC05PL4

OSC2 on MC68HC05PL4B

PA1

DACEN

PA1/DTMF

DAC DTMF Output

PA2

TCAPEN

PA2/TCAP

16-bit Timer Input Capture

PA3

TCMPEN

PA3/TCMP

16-bit Timer Output Compare

Port B

PB3-PB0

KBIE3-KBIE0

PUL3-PUL0

PB3/KBI3-PB0/KBI0

Keyboard Interrupt

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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