Usart Prescaler Register (Usart_Presc) - ST STM32G0 1 Series Reference Manual

RM0444
33.8.14

USART prescaler register (USART_PRESC)

This register can only be written when the USART is disabled (UE = 0).
Address offset: 0x2C
Reset value: 0x0000 0000
31 30 29
Res. Res. Res. Res.
15 14 13
Res. Res. Res. Res.
Bits 31:4 Reserved, must be kept at reset value.
Bits 3:0 PRESCALER[3:0]: Clock prescaler
The USART input clock can be divided by a prescaler factor:
Note: When PRESCALER is programmed with a value different of the allowed ones,
28 27 26 25
Res. Res. Res.
12 11 10 9
Res. Res. Res.
0000: input clock not divided
0001: input clock divided by 2
0010: input clock divided by 4
0011: input clock divided by 6
0100: input clock divided by 8
0101: input clock divided by 10
0110: input clock divided by 12
0111: input clock divided by 16
1000: input clock divided by 32
1001: input clock divided by 64
1010: input clock divided by 128
1011: input clock divided by 256
Remaining combinations: Reserved
programmed prescaler value is 1011 i.e. input clock divided by 256.
Universal synchonous receiver transmitter (USART)
24 23 22
Res. Res. Res.
8 7 6
Res. Res. Res.
RM0444 Rev 5
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
Res. Res. PRESCALER[3:0]
rw rw
17 16
Res. Res.
1 0
rw rw
1083/1390
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