UPSD3233 STMicroelectronics, UPSD3233 Datasheet - Page 69

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

Figure 32. Serial Port Mode 2, Waveforms
Figure 33. Serial Port Mode 3, Block Diagram
SMOD
RCLK
TCLK
Sample Times
Write to SBUF
Overflow
Timer1
÷2
Bit Detector
Generator
Rx Clock
Tx Clock
Stop Bit
0
Send
Data
Shift
Shift
RxD
TxD
1
RI
0
0
TI
1
1
Overflow
Timer2
RxD
SBUF
Write
to
Start Bit
S1P1
Start Bit
÷16 Reset
Transition
Detector
D0
D0
1-to-0
Sample
UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
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
RB8
TB8
Stop Bit
Stop Bit
AI06845
AI06846
Transmit
Receive
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TxD