Allowable Baud Rate Range During Reception; Figure 15-22: Allowable Baud Rate Range During Reception - NEC V850E/PH2 User Manual

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

UARTCn
transfer rate
Minimum
allowable
transfer rate
Maximum
allowable
transfer rate
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.
-1
FL = (BR)
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:
642
Chapter 15 Asynchronous Serial Interface C (UARTC)
Latch timing
Start bit
Bit 0
FL
Bit 0
Start bit
Start bit Bit 0
FLmin = 11 × FL -
User's Manual U16580EE3V1UD00
Bit 1 Bit 7
×
1 data frame (11
Bit 1 Bit 7
FLmin
Bit 1
FLmax
k - 2
21k + 2
× FL =
2k
2k
Parity bit Stop bit
FL)
Stop bit
Parity bit
Parity bit Stop bit
Bit 7
FL