UPSD3234AV-24U1T STMicroelectronics, UPSD3234AV-24U1T Datasheet - Page 61

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

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Figure 27. Serial Port Mode 0, Block Diagram
Figure 28. Serial Port Mode 0, Waveforms
SBUF
Write
to
TxD (Shift Clock)
TxD (Shift Clock)
REN
RxD (Data Out)
Write to SCON
R1
Write to SBUF
S6
RxD (Data In)
Receive
Send
Shift
Shift
RI
T
Interrupt
Serial
S6P2
Clear RI
Port
D
CL
D0
S
S3P1
Rx Clock
Tx Clock
Start
Start
SBUF
Q
Read
D0
SBUF
Load
D1
S6P1
uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
D1
Zero Detector
D2
Rx Control
7 6 5 4 3 2 1 0
Tx Control
Input Shift Register
Internal Bus
Internal Bus
T
R
D2
SBUF
D3
SBUF
D3
D4
Receive
Send
D4
Shift
Shift
D5
Shift
D5
D6
D6
D7
Clock
Shift
RxD
P3.0 Alt
Input
Function
D7
Transmit
Receive
RxD
P3.0 Alt
Output
Function
TxD
P3.1 Alt
Output
Function
AI06824
AI06825
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