UPSD33XX Datasheet, PDF (86/231 Pages) STMicroelectronics – Fast 8032 MCU with Programmable Logic

uPSD33xx
Figure 28. UART Mode 0, Block Diagram
Write
to
SBUF
Internal Bus
D SQ
CL
SBUF
Zero Detector
fOSC/12
REN
R1
Start
Tx Clock
Tx Control
T
Shift
Send
Serial
Port
Interrupt
Rx Clock
Start
R
Receive
Rx Control
Shift
76543210
Load
SBUF
Read
SBUF
Input Shift Register
SBUF
Shift
Internal Bus
RxD
Pin
Shift
Clock
TxD
Pin
RxD
P3.0 Alt
Input
Function
AI06824
Figure 29. UART Mode 0, Timing Diagram
Write to SBUF
Send
Shift
RxD (Data Out)
TxD (Shift Clock)
TI
Write to SCON
RI
Receive
Shift
RxD (Data In)
TxD (Shift Clock)
D0
D1
D2
D3
D4
D5
D6
D7
Clear RI
D0
D1
D2
D3
D4
D5
D6
D7
Transmit
Receive
AI06825
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