MC68HC705JJ7 Datasheet, PDF (66/164 Pages) Freescale Semiconductor, Inc – Microcontrollers

Parallel Input/Output
5. If the PB7/SCK pin is to be a digital output, then the SPE bit in the SCR must be cleared and the
DDRB7 bit must be set. The pulldown device will be disabled when the pin is set as an output.
Table 7-3. Port B Pin Functions — PB5–PB7
Port B
Pin
SIOP
SPE MSTR
Control Bits
SWPDI
in MOR
Port B
PDIBx
DDRBx⁽¹⁾
0
0
0
0
1
0
0
X⁽²⁾
1
X
0
PB5
X⁽²⁾
X⁽²⁾
1
0
1
X⁽²⁾
X⁽²⁾
X⁽²⁾
1
0
0
0
0
1
0
0
X⁽²⁾
1
X⁽²⁾
0
PB6
X⁽²⁾
X⁽²⁾
1
0
1
X⁽²⁾
X⁽²⁾⁾
X⁽²⁾
1
0
0
0
0
1
0
0
X⁽²⁾
1
X⁽²⁾
0
PB7
X⁽²⁾
X⁽²⁾
1
0
0
X⁽²⁾
X⁽²⁾
1
1
0
1
X⁽²⁾
X⁽²⁾
1
1. DDRB can always be read or written.
2. Don’t care
PORTB Access
(Pin or Data
Register)
Read
Write
Pin
Data
Pin
Data
Pin
Data
Data
Data
SDO
Data
Pin
Pin
Data
Data
Data
Data
Pin
Data
Data
Data
SDI
Data
Pin
Pin
Data
Data
Data
Data
Pin
Data
Data
Data
SCK
Data
SCK
Data
Data
Data
Data
Data
Result on
Port B Pins
Pulldown
On
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
Pin
PB5 in
PB5 in
PB5 in
PB5 out
SDO out
SDO out
PB6 in
PB6 in
PB6 in
PB6 out
SDI in
SDI in
PB7 in
PB7 in
PB7 in
PB7 out
SCK in
SCK in
SCK out
SCK out
MC68HC705JJ7 • MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
66
Freescale Semiconductor