MC68HC705MC4 Datasheet, PDF (46/99 Pages) Motorola, Inc – Microcontrollers

MC68HC705MC4 Specification Rev. 1.5
Table 6-1: Port A I/O Pin Functions
DDRA
I/O Pin Mode
Accesses
to DDRA
@ $0004
Accesses to
Data Register
@ $0000
Read/Write Read Write
0
IN, Hi-Z
1
OUT
DDRA0-7
DDRA0-7
PA0-7
*
PA0-7 PA0-7
* Does not affect input, but stored to Data Register
Table 6-2: Port B I/O Pin Functions
DDRB
I/O Pin Mode
Accesses
to DDRB
@ $0005
Accesses to
Data Register
@ $0001
Read/Write Read Write
0
IN, Hi-Z
1
OUT
DDRB4-7
DDRB4-7
PB4-7
PB4-7
* Does not affect input, but stored to Data Register
*
PB4-7
Table 6-3: Port C I/O Pin Functions
DDRC
I/O Pin Mode
Accesses
to DDRC
@ $0006
Accesses to
Data Register
@ $0002
Read/Write Read Write
0
IN, Hi-Z
1
OUT
DDRC0-7
DDRC0-7
PC0-7
PC0-7
* Does not affect input, but stored to Data Register
*
PC0-7
Table 6-4: Port D I/O Pin Functions
DDRD
0
1
I/O Pin Mode
IN, Hi-Z
OUT
Accesses
to DDRD
@ $0007
Read/Write
DDRD6
DDRD6
Accesses to
Data Register
@ $0003
Read Write
PD6-7
*
PD6 PD6
* Does not affect input, but stored to Data Register
NOTE: To avoid generating a glitch on an I/O port pin, data should be written to
the I/O port data register before writing a logical one to the
corresponding Data Direction Register.
Section 6: Input/Output Ports
MOTOROLA
Page 37