MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 270

• Manufacturer Part Number: MC68HC908AP16CFA
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Infrared Serial Communications
14.9 I/O Signals
14.9.1 PTC6/SCTxD (Transmit Data)
14.9.2 PTC7/SCRxD (Receive Data)
Data Sheet
270
NOTE:
NOTE:
To protect status bits during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), software can read and write
I/O registers during the break state without affecting status bits. Some
status bits have a two-step read/write clearing procedure. If software
does the first step on such a bit before the break, the bit cannot change
during the break state as long as BCFE is at logic 0. After the break,
doing the second step clears the status bit.
The two IRSCI I/O pins are:
The PTC6/SCTxD pin is the serial data (standard or infrared) output from
the SCI transmitter. The IRSCI shares the PTC6/SCTxD pin with port C.
When the IRSCI is enabled, the PTC6/SCTxD pin is an output
regardless of the state of the DDRC6 bit in data direction register C
(DDRC).
The PTC6/SCTxD pin is an open-drain pin when configured as an
output. Therefore, when configured as SCTxD or a general purpose
output pin (PTC6), a pullup resistor must be connected to this pin.
The PTC7/SCRxD pin is the serial data input to the IRSCI receiver. The
IRSCI shares the PTC7/SCRxD pin with port C. When the IRSCI is
enabled, the PTC7/SCRxD pin is an input regardless of the state of the
DDRC7 bit in data direction register C (DDRC).
The PTC7/SCRxD pin is an open-drain pin when configured as an
output. Therefore, when configured as a general purpose output pin
(PTC7), a pullup resistor must be connected to this pin.
Freescale Semiconductor, Inc.
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For More Information On This Product,
PTC6/SCTxD — Transmit data
PTC7/SCRxD — Receive data
Go to: www.freescale.com
MC68HC908AP Family — Rev. 2.5
MOTOROLA