參數(shù)資料
型號: MC80C0224Q
廠商: Electronic Theatre Controls, Inc.
元件分類: 8位微控制器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 80/128頁
文件大小: 1408K
代理商: MC80C0224Q
MC80F0208/16/24
Preliminary
76
MAR. 2005 Ver 0.2
17. UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
17.1 UART Serial Interface Functions
The Universal Asynchronous Receiver/Transmitter(UART) en-
ables full-duplex operation wherein one byte of data after the start
bit is transmitted and received. The on-chip baud rate generator
dedicated to UART enables communications using a wide range
of selectable baud rates. In addition, a baud rate can also be de-
fined by dividing clocks input to the ACLK pin.
The UART driver consists of RXR, TXR, ASIMR, ASISR and
BRGCR register. Clock asynchronous serial I/O mode (UART)
can be selected by ASIMR register. Figure 17-1 shows a block di-
agram of the UART driver.
Note:
The UART1 control register ASIMR1,ASISR1,
BRGCR1, RXR1 and TXR1 are located at EE6H ~ EE9H
address. These address must be accessed(read and writ-
ten) by absolute addressing manipulation instruction.
Figure 17-1 UART Block Diagram
(ASISR)
Transmit Shift Register
(TXR)
Internal Data Bus
TxD PIN
RxD PIN
TxE
RxE
ACLK PIN
f
XIN
/2 ~ f
XIN
/2
7
Transmit Controller
(Parity Addition)
Receive Buffer Register
(RXR)
Receive Shift Register
(RX)
Receive Controller
(Parity Check)
Baud Rate
Generator
2
1
0
PE
FE
OVE
UARTxIF
(UARTx interrupt)
TXxIOF
RXxIOF
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