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AN3123 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3123
Description  Using the UART interfaces in the SPEAr embedded MPU family
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3123 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3123
2/30
Doc ID 16862 Rev 2
Contents
1
Purpose and scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
UART signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
SPEAr600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2
SPEAr300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3
SPEAr310 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4
SPEAr320 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5
SPEAr320S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Clock source and frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Clock related registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
Changing the UART baud rate on the fly . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
Baud rate related registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
UART protocol flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6
UART controller data flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1
UART data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7
UART interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.1
Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2
Interrupt types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2.1
UARTRXINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2.2
UARTTXINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.3
UARTRTINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.4
UARTMSINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.5
UARTEINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.6
UARTINTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.3
Interrupt related registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8
DMA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1
DMA operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19


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