mc68hc908ap8cfa Freescale Semiconductor, Inc, mc68hc908ap8cfa Datasheet - Page 168

• Manufacturer Part Number: mc68hc908ap8cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface Module (SCI)
11.7.2 RxD (Receive Data)
When the SCI is enabled (ENSCI=1), the PTB3/RxD pin becomes the serial data input, RxD, to the SCI
receiver regardless of the state of the DDRB3 bit in data direction register B (DDRB).
11.8 I/O Registers
These I/O registers control and monitor SCI operation:
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SCI control register 1 (SCC1)
SCI control register 2 (SCC2)
SCI control register 3 (SCC3)
SCI status register 1 (SCS1)
SCI status register 2 (SCS2)
SCI data register (SCDR)
SCI baud rate register (SCBR)
The PTB2/TxD pin is an open-drain pin when configured as an output.
Therefore, when configured as a general purpose output pin (PTB2), a
pullup resistor must be connected to this pin.
The PTB3/RxD pin is an open-drain pin when configured as an output.
Therefore, when configured as a general purpose output pin (PTB3), a
pullup resistor must be connected to this pin.
MC68HC908AP Family Data Sheet, Rev. 4
NOTE
NOTE
Freescale Semiconductor