MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 71

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Function:
Alternate
Address:
data register returns the logic state of the pin. Reset has no effect on port
B data.
PB1/OSC3 — Port B Data Bit 1
PB0 — Port B Data Bit 0
Bits 7–2 — Not used
Reset:
Read:
Write:
This read/write bit is software programmable. Data direction of PB1 is
under the control of the DDRB1 bit in data direction register B.
When the 3-pin RC oscillator mask option is selected, PB1/OSC3 is
used as an oscillator output. Using the 3-pin RC oscillator
configuration affects port B in these ways:
•
•
•
This read/write bit is software-programmable. Data direction of PB0 is
under the control of the DDRB0 bit in data direction register B.
Bits 7–2 always read as logic 0s.
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit PB1 can be used as a read/write storage location without
affecting the oscillator. Reset has no effect on bit PB1.
Bit DDRB1 in data direction register B can be used as a read/write
storage location without affecting the oscillator. Reset clears
DDRB1.
The PB1/OSC3 pulldown device is disabled.
$0001
Bit 7
0
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Figure 7-5. Port B Data Register (PORTB)
Parallel Input/Output (I/O)
= Unimplemented
6
0
5
0
Unaffected by reset
4
0
3
0
Parallel Input/Output (I/O)
2
0
OSC3
PB1
1
Technical Data
Bit 0
PB0
Port B