Figure 13-19: Allowable Baud Rate Range During Reception - NEC V850E/CA2 JUPITER Preliminary User's Manual

(3) Allowable baud rate range during reception
The degree to which a discrepancy from the transmission destination's baud rate is allowed during
reception is shown below.
Caution: The equations described below should be used to set the baud rate error during
reception so that it always is within the allowable error range.

Figure 13-19: Allowable Baud Rate Range During Reception

UART5n
transfer rate
Minimum allowable
transfer rate
Maximum allowable
transfer rate
As shown in Figure 13-19, after the start bit is detected, the receive data latch timing is determined
according to the counter that was set by the BRGCm register. If all data up to the final data (stop
bit) is in time for this latch timing, the data can be received normally.
Applying this to 11-bit reception is, theoretically, as follows.
BR: UART5n baud rate
k: BRGCm register setting value
FL: 1-bit data length
Chapter 13 Serial Interface Function
Latch timing
Start bit Bit 0
FL
Start bit Bit 0
Start bit Bit 0
FL
Preliminary User's Manual U15839EE1V0UM00
Bit 1 Bit 7
1 data frame (11 ⋅ FL)
Bit 1 Bit 7
FLmin
Bit 1 Bit 7
FLmax
-1
FL = BR
Parity bit Stop bit
Parity bit Stop bit
Parity bit Stop bit
389