RM0016 Universal asynchronous receiver transmitter (UART)
Doc ID 14587 Rev 8 359/449
22.7.12 Prescaler register (UART_PSCR)
Address offset: 0x0A (UART1), 0x0B (UART2)
Reset value: 0x00
Note: Care must be taken to program this register with correct value, when both Smartcard and
IrDA interfaces are used in the application
76543210
PSC[7:0]
rw rw rw rw rw rw rw rw
Bits 7:0 PSC[7:0]: Prescaler value.
– In IrDA Low Power mode
PSC[7:0] = IrDA Low Power Baud Rate
(1)
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):
0000 0000: Reserved - do not program this value
0000 0001: divides the source clock by 1
0000 0010: divides the source clock by 2
...
– In Smartcard mode
PSC[4:0]: Prescaler value.
(2)
(3)
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:
0 0000: Reserved - do not program this value
0 0001: divides the source clock by 2
0 0010: divides the source clock by 4
0 0011: divides the source clock by 6
...
Note: These bits are not available for UART3.
1. This prescaler setting has no effect if IrDA mode is not enabled.
2. This prescaler setting has no effect if Smartcard mode is not enabled.
3. Bits [7:5] have no effect even if Smartcard mode is enabled.
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