MC68HC05K0 Datasheet, PDF (74/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Technical Data
Freescale Semiconductor, Inc.
7.4.4 Port B Logic
Figure 7-8 shows the port B I/O logic.
READ $0005
WRITE $0005
DATA DIRECTION
REGISTER B
BIT (DDRB1)
TO 3-PIN
OSCILLATOR
WRITE $0001
READ $0001
WRITE $0011
READ $0005
WRITE $0005
WRITE $0001
READ $0001
WRITE $0011
RESET
Technical Data
PORT B DATA
REGISTER
BIT (PB1)
PULLDOWN
REGISTER B
BIT (PDIB1)
PULLDOWNS ENABLED
(MASK OPTION)
3-PIN RC OSCILLATOR
(MASK OPTION)
RC OSCILLATOR
(MASK OPTION)
(ACTIVE LOW)
DATA DIRECTION
REGISTER B
BIT (DDRB0)
PORT B DATA
REGISTER
BIT (PB0)
PB1/
OSC3
100-mA
PULLDOWN
DEVICE
PB0
PULLDOWN
REGISTER B
BIT (PDIB0)
100-mA
PULLDOWN
DEVICE
Figure 7-8. Port B I/O Circuit
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Parallel Input/Output (I/O)
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