Low-power universal asynchronous receiver transmitter (LPUART) RM0440
1720/2126 RM0440 Rev 4
38.6.5 LPUART baud rate register (LPUART_BRR)
This register can only be written when the LPUART is disabled (UE=0). It may be
automatically updated by hardware in auto baud rate detection mode.
Address offset: 0x0C
Reset value: 0x0000 0000
Note: It is forbidden to write values lower than 0x300 in the LPUART_BRR register.
Provided that LPUART_BRR must be ≧
0x300 and LPUART_BRR is 20 bits, a care should
be taken when generating high baud rates using high fck values. fck must be in the range [3
x baud rate..4096 x baud rate].
Bit 6 DMAR: DMA enable receiver
This bit is set/reset by software
1: DMA mode is enabled for reception
0: DMA mode is disabled for reception
Bits 5:4 Reserved, must be kept at reset value.
Bit 3 HDSEL: Half-duplex selection
Selection of Single-wire Half-duplex mode
0: Half duplex mode is not selected
1: Half duplex mode is selected
This bit can only be written when the LPUART is disabled (UE=0).
Bits 2:1 Reserved, must be kept at reset value.
Bit 0 EIE: Error interrupt enable
Error Interrupt Enable Bit is required to enable interrupt generation in case of a framing
error, overrun error or noise flag (FE=1 or ORE=1 or NE=1 in the LPUART_ISR register).
0: Interrupt is inhibited
1: An interrupt is generated when FE=1 or ORE=1 or NE=1 in the LPUART_ISR register.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. BRR[19:16]
rw rw rw rw
1514131211109876543210
BRR[15:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:20 Reserved, must be kept at reset value.
Bits 19:0 BRR[19:0]: LPUART baud rate
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