mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 300

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface Module (SCI)
14.7 I/O Signals
14.7.1 PTF5/TxD (Transmit Data)
14.7.2 PTF4/RxD (Receive Data)
14.8 I/O Registers
Technical Data
300
Port F shares two of its pins with the SCI module. The two SCI I/O pins
are:
The PTF5/TxD pin is the serial data output from the SCI transmitter. The
SCI shares the PTF5/TxD pin with port F. When the SCI is enabled, the
PTF5/TxD pin is an output regardless of the state of the DDRF5 bit in
data direction register F (DDRF).
The PTF4/RxD pin is the serial data input to the SCI receiver. The SCI
shares the PTF4/RxD pin with port F. When the SCI is enabled, the
PTF4/RxD pin is an input regardless of the state of the DDRF4 bit in data
direction register F (DDRF).
The following I/O registers control and monitor SCI operation:
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Serial Communications Interface Module (SCI)
PTF5/TxD — Transmit data
PTF4/RxD — Receive data
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)
MC68HC708MP16
Freescale Semiconductor
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Rev. 3.1