
Technical Data
MC68HC705K1 — Rev. 2.0
74
Parallel Input/Output (I/O)
MOTOROLA
Parallel Input/Output (I/O)
Table 7-3. PB1/OSC3 Pin Functions
Control Bits
PB1/OSC3
Pin Mode
Accesses
to PDRB
Accesses
to DDRB
Accesses
to PORTB
RC
PIN3
SWPDI
PDIB1
DDRB1
Read
Write
Read/Write
Read
Write
0
X(1)
1
X
0
Input, hi-z
U(2)
PDIB1
DDRB1
Pin
PB1
0
X
1
X
1
Output
U
PDIB1
DDRB1
PB1
0X
0
Input,
pulldown on
U
PDIB1
DDRB1
Pin
PB1
0
X
0
1
Output
U
PDIB1
DDRB1
PB1
0
X
0
1
0
Input, hi-z
U
PDIB1
DDRB1
Pin
PB1
0
X
0
1
Output
U
PDIB1
DDRB1
PB1
1
0
1
X
0
Input, hi-z
U
PDIB1
DDRB1
Pin
PB1
1
0
1
X
1
Output
U
PDIB1
DDRB1
PB1
10
0
Input,
pulldown on
U
PDIB1
DDRB1
Pin
PB1
1
0
1
Output
U
PDIB1
DDRB1
PB1
1
0
1
0
Input, hi-z
U
PDIB1
DDRB1
Pin
PB1
1
0
1
Output
U
PDIB1
DDRB1
PB1
11
X
3-pin
RC oscillator
output
U
PDIB1
DDRB1
PB1
1. X = Don’t care
2. U = Undefined