MC81F4332 Datasheet, PDF (149/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

MC81F4432
24. UART
BRDATA
1/8
1/4
M
U
Baud Rate
1/2
X
Generator
1/1
UCLK
Write to
UDAT
SDR
URIR
1-to-0
Transition
Detector
UTIF
UART Tx INT
UART Rx INT
URIF
Data Bus
TB8
D ^SQ
CLK
UDAT
Zero Detector
CLK
UMS0
UMS1
Start
Tx Control
Tx Clock _UTIR
Shift
EN
Send
Uart Tx INT request
Uart Tx INT enable
UTIE
URIE
Uart Rx INT enable
Uart Rx INT request
Rx Clock
URIR
Receive
Rx Control
Start
Shift
Bit Detector
Shift
Value
Shift
Clock
RxD
TxD
TxD
UMS0
UMS1
RxD
Shift
Register
UDAT
Data Bus
Figure 24-1 UART Block Diagram
The UART block has four communication modes. One synchronous mode and three UART (Universal
Asynchronous Receiver/Transmitter) modes.
- Mode 0 : Serial I/O with baud rate of fxx/(16 × (BRDAT+1))
half-duplex and master mode only
- Mode 1 : 8-bit UART mode; variable baud rate : no parity bit
- Mode 2 : 9-bit UART mode; fxx/16
- Mode 3 : 9-bit UART mode, variable baud rate
October 19, 2009 Ver.1.35
149