mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 273

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

16.8.2 RxD (Receive Data)
16.9 I/O Registers
16.9.1 SCI Control Register 1
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
NOTE:
When the SCI is enabled (ENSCI=1), the PTB3/SCL1/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).
The PTB3/SCL1/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.
These I/O registers control and monitor SCI operation:
SCI control register 1:
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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)
Enables loop mode operation
Enables the SCI
Controls output polarity
Controls character length
Controls SCI wakeup method
Controls idle character detection
Enables parity function
Controls parity type
Serial Communications Interface (SCI)
Serial Communications Interface (SCI)
I/O Registers
Data Sheet
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