UPSD3234AV-24U1T STMicroelectronics, UPSD3234AV-24U1T Datasheet - Page 62

• Manufacturer Part Number: UPSD3234AV-24U1T
• Description: Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
• Manufacturer: STMicroelectronics

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uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
Figure 29. Serial Port Mode 1, Block Diagram
Figure 30. Serial Port Mode 1, Waveforms
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SMOD
RCLK
TCLK
Write to SBUF
Sample Times
Overflow
Timer1
÷2
Bit Detector
Rx Clock
Tx Clock
0
Send
Data
Shift
Shift
RxD
1
TxD
T1
RI
0
0
1
1
Overflow
Timer2
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
Rx Detector
D2
D
CL
TB8
S
Rx Clock
D3
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
AI06826
AI06843
Transmit
Receive
TxD