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ST STM32F10 Series User Manual

ST STM32F10 Series
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UM0306 Universal synchronous asynchronous receiver transmitter (USART)
417/519
17.4.7 Guard time and prescaler register (USART_GTPR)
Address Offset: 18h
Reset Value: 0000h
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
1514131211109876543210
GT[7:0] PSC[7:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:16 Reserved, forced by hardware to 0.
Bits 15:8
GT[7:0]: Guard time value.
This bit-field gives the Guard time value in terms of number of baud clocks.
This is used in Smartcard mode. The Transmission Complete flag is set after this
guard time value.
Bits 7:0
PSC[7:0]: Prescaler value.
– In IrDA Low-power mode:
PSC[7:0] = IrDA Low-Power Baud Rate
Used for programming the prescaler for dividing the system clock to achieve the
low-power frequency:
The source clock is divided by the value given in the register (8 significant bits):
00000000: Reserved - do not program this value
00000001: divides the source clock by 1
00000010: divides the source clock by 2
...
– In normal IrDA mode: PSC must be set to 00000001.
– In smartcard mode:
PSC[4:0]: Prescaler value.
Used for programming the prescaler for dividing the system clock to provide the
smartcard clock.
The value given in the register (5 significant bits) is multiplied by 2 to give the
division factor of the source clock frequency:
00000: Reserved - do not program this value
00001: divides the source clock by 2
00010: divides the source clock by 4
00011: divides the source clock by 6
...
Note:
1: Bits [7:5] have no effect if Smartcard mode is used.
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ST STM32F10 Series Specifications

General IconGeneral
BrandST
ModelSTM32F10 Series
CategoryMicrocontrollers
LanguageEnglish

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