UPSD3354DV-40U6 Datasheet, PDF (113/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

UPSD33xx
Serial UART interfaces
Figure 27. UART mode 0, block diagram
Internal Bus
Write
to
SBUF
DS
Q
CL
SBUF
RxD
Pin
Zero Detector
fOSC/12
Start
Tx Clock
Tx Control
T
Shift
Send
Serial
Port
Interrupt
Shift
) REN
bsolete ^{Product(s R1}
Rx Clock
Start
R
Receive
Rx Control
Shift
76543210
Load
SBUF
Read
SBUF
Input Shift Register
SBUF
Shift
Internal Bus
Clock
RxD
P3.0 Alt
Input
Function
TxD
Pin
AI06824
) ^{- O} _{Figure 28. UART mode 0, timing diagram}
ct(s _{Write to SBUF}
u _Send
d _Shift
ro ^{RxD (Data Out)}
TxD (Shift Clock)
P _TI
te _{Write to SCON}
le _RI
o _Receive
s _Shift
b _{RxD (Data In)}
O TxD (Shift Clock)
D0
D1
D2
D3
D4
D5
D6
D7
Clear RI
D0
D1
D2
D3
D4
D5
D6
D7
Transmit
Receive
AI06825
Doc ID 9685 Rev 7
113/272