UPSD3233 STMicroelectronics, UPSD3233 Datasheet - Page 68

• Manufacturer Part Number: UPSD3233
• Description: Flash Programmable System Devices with 8032 Microcontroller Core
• Manufacturer: STMicroelectronics

UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
Figure 30. Serial Port Mode 1, Waveforms
Figure 31. Serial Port Mode 2, Block Diagram
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SMOD
Phase2 Clock
Sample Times
Write to SBUF
1/2*f OSC
÷2
Bit Detector
Rx Clock
Tx Clock
0
Send
Data
Shift
Shift
RxD
TxD
1
T1
RI
RxD
SBUF
Write
to
Start Bit
S1P1
Start Bit
÷16 Reset
Transition
Detector
D0
D0
1-to-0
Sample
D1
D1
÷16
Interrupt
Serial
Port
D2
D2
Rx Detector
D
CL
TB8
S
D3
Rx Clock
D3
Tx Clock
Start
Start
SBUF
Read
Q
÷16
SBUF
Load
D4
D4
Zero Detector
Rx Control
Tx Control
Input Shift Register
D5
D5
Internal Bus
Internal Bus
TI
RI
SBUF
SBUF
1FFh
D6
D6
Shift
Load SBUF
D7
D7
Send
Data
Shift
Shift
Stop Bit
Stop Bit
AI06843
AI06844
Transmit
Receive
TxD