mc68hc05pv8a Freescale Semiconductor, Inc, mc68hc05pv8a Datasheet - Page 102

• Manufacturer Part Number: mc68hc05pv8a
• Description: Mc68hc05pv8a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Technical Data
7.6 Port C (High Voltage Port)
Technical Data
PB2IC – PB2 Input Capture Enable
PB1OC – PB1 Output Compare Enable
PB0IC – PB0 Input Capture Enable
Port C is a 7-bit multifunctional and bidirectional port (PC0–6) with high
voltage capability. The port is shared with timer and PWM channels
(TCAP, TCMP, PWM) and provides a special contact sense feature with
interrupt capability.
In addition, port C comprises a low ohmic two channel low side driver
with internal Zener diode turn-off for switching inductive loads.
The port C data register is at $0002 and the data direction register (DDR)
is at $0006. Reset does not affect the data registers, but clears the data
direction registers, thereby returning the PC0–4 to high voltage inputs,
PC5 and PC6 are switched to the off state. Writing a one to a DDR bit
sets the corresponding port bit to output or contact sense mode.
The port C pins PC5–6 are open drain outputs only without internal
pull-ups.
The voltage levels of PC0–4 I/O signals are related to the V
levels respectively. PC5–6 have an additional power supply pin for VSS
(PVSS) to which the low side drivers relate.
This bit enables the PB2 pin to drive the input capture channel 2.
This bit enables the PB1 pin for output compare channel 1.
This bit enables the PB0 pin to drive the input capture channel 1.
Freescale Semiconductor, Inc.
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1 = PB2 drives the input capture channel 2
0 = PC2 drives the input capture channel 2
1 = PB1 output compare channel 1 enabled. PBDD1 bit must be set
0 = PB1 output compare channel 1disabled
1 = PB0 drives the input capture channel 1
0 = PC0 or PC4 drives the input capture channel 1
in order to drive the output
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Input/Output Ports
MC68HC(8)05PV8/A — Rev. 1.9
SUP
and V
SS