mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 226

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
17.8 I/O Signals
17.8.1 PTE0/TxD (Transmit Data)
17.8.2 PTE1/RxD (Receive Data)
17.9 I/O Registers
Technical Data
224
Port E shares two of its pins with the SCI module. The two SCI I/O pins
are:
The PTE0/TxD pin is the serial data output from the SCI transmitter. The
SCI shares the PTE0/TxD pin with port E. When the SCI is enabled, the
PTE0/TxD pin is an output regardless of the state of the DDRE2 bit in
data direction register E (DDRE).
The PTE1/RxD pin is the serial data input to the SCI receiver. The SCI
shares the PTE1/RxD pin with port E. When the SCI is enabled, the
PTE1/RxD pin is an input regardless of the state of the DDRE1 bit in data
direction register E (DDRE).
These I/O registers control and monitor SCI operation:
•
•
•
•
•
•
•
•
•
PTE0/TxD — Transmit data
PTE1/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)
Serial Communications Interface (SCI)
Freescale Semiconductor
MC68HC08QA24