642
Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
15.6.5 Allowable baud rate range during reception
The baud rate error range at the destination that is allowable during reception is shown below.
Caution:
The baud rate error during reception must be set within the allowable error range
using the following equation.
Figure 15-22:
Allowable Baud Rate Range During Reception
Remark:
n = 0 to 2
As shown in Figure 15-22, the receive data latch timing is determined by the counter set using the
UCnCTL2 register following start bit detection. The transmit data can be normally received if up to the
last data (stop bit) can be received in time for this latch timing.
When this is applied to 11-bit reception, the following results in terms of logic.
FL = (BR)
-1
BR:
UARTCn baud rate (n = 0, 1)
k:
UCnCTL2 setting value (n = 0, 1)
FL:
1-bit data length
Latch timing margin: 2 clocks
Minimum allowable transfer rate:
FL
1 data frame (11
FL)
×
FLmin
FLmax
UARTCn
transfer rate
Start bit
Bit 0
Bit 1
Bit 7
Parity bit
Minimum
allowable
transfer rate
Maximum
allowable
transfer rate
Stop bit
Start bit
Bit 0
Bit 1
Bit 7
Parity bit
Latch timing
Stop bit
Start bit
Bit 0
Bit 1
Bit 7
Parity bit
Stop bit
FLmin = 11
×
FL -
×
FL = FL
k - 2
21k + 2
2k
2k
Содержание MuPD70F3187
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