Freescale Semiconductor, Inc.
April 30, 1998
GENERAL RELEASE SPECIFICATION
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
7.5
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.
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
PA0 on MC68HC05PL4
OSC2 on MC68HC05PL4B
PA0
—
PA0 or OSC2
PA1
PA2
PA3
DACEN
TCAPEN
TCMPEN
PA1/DTMF
PA2/TCAP
PA3/TCMP
DAC DTMF Output
Port A
Port B
16-bit Timer Input Capture
16-bit Timer Output Compare
KBIE3-KBIE0
PUL3-PUL0
PB3-PB0
PB3/KBI3-PB0/KBI0
Keyboard Interrupt
MC68HC05PL4
REV 2.0
INPUT/OUTPUT PORTS
7-3
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