XC68HC705JJ7 Motorola, XC68HC705JJ7 Datasheet - Page 90

• Manufacturer Part Number: XC68HC705JJ7
• Description: MICROCONTROLLER
• Manufacturer: Motorola

Parallel Input/Output
7.4 Port B
7.4.1 Port B Data Register
Advance Information
90
Port B is an 8-bit, general-purpose, bidirectional I/O port with these
features:
The port B data register (PORTB) contains a bit for each of the port B
pins. When a port B pin is programmed to be an output, the state of its
data register bit determines the state of the output pin. When a port B pin
is programmed to be an input, reading the port B data register returns
the logic state of the pin. Reset has no effect on port B data.
PB0-PB7 — Port B Data Bits
Alternate:
Alternate:
Alternate:
Address:
•
•
•
•
•
•
•
Reset:
These read/write bits are software programmable. Data direction of
each bit is under the control of the corresponding bit in data direction
register B. Reset has no effect on port B data.
Read:
Write:
Programmable pulldown devices
PB0–PB4 are shared with the analog subsystem.
PB3 and PB4 are shared with the 16-bit programmable timer.
PB4 can be driven directly by the output of comparator 1.
PB5–PB7 are shared with the simple serial interface (SIOP).
High current sinking capability on the PB4 pin
High current sourcing capability on the PB4 pin
$0001
Bit 7
SCK
SCK
SCK
PB7
Figure 7-5. Port B Data Register (PORTB)
Parallel Input/Output
PB6
SDI
SDI
SDI
6
SDO
SDO
SDO
PB5
5
Unaffected by reset
MC68HC705JJ7 • MC68HC705JP7 — REV 4
TCMP
CMP1
PB4
AN4
4
TCAP
TCAP
AN3
PB3
3
AN2
AN2
PB2
AN2
2
PB1
AN1
AN1
AN1
1
MOTOROLA
Bit 0
PB0
AN0
AN0
AN0