Universal Asynchronous Receiver/ Transmitter (Uart); Uart Serial Interface Functions - Abov MC80F0304 User Manual

MC80F0304/08/16
16. UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)

16.1 UART Serial Interface Functions

ables full-duplex operation wherein one byte of data after the start The Universal Asynchronous Receiver / Transmitter (UART) en- BRGCR register. Universal asynchronous serial I/O mode The UART driver consists of RXR, TXR, ASIMR, ASISR and
bit is transmitted and received. The on-chip baud rate generator (UART) can be selected by ASIMR register. Figure 16-1 shows
dedicated to UART enables communications using a wide range a block diagram of the UART driver.
fined by dividing clocks input to the ACLK pin. of selectable baud rates. In addition, a baud rate can also be de-
Internal Data Bus
Receive Buffer Register
(RXR)
RxE
RxD PIN Receive Shift Register (RX) Transmit Shift Register (TXR)
PE 2 FE 1 0 OVE (ASISR)
TxE
TxD PIN Transmit Controller (Parity Addition) (UART tramsmit interrupt) INT_TX
(Parity Check) Receive Controller (UART receive interrupt) INT_RX
ACLK PIN Baud Rate
f XIN ÷2 ~ f XIN ÷128 Generator
Figure 16-1 UART Block Diagram
November 4, 2011 Ver 2.12 85