CHAPTER 14 SERIAL ARRAY UNIT
Page 425 of 920
(3) Permissible baud rate range for reception
The permissible baud rate range for reception during UART (UARTq) communication can be calculated by
the following expression. Make sure that the baud rate at the transmission side is within the permissible
baud rate range at the reception side.
Brate: Calculated baud rate value at the reception side (See
(1) Baud rate calculation expression
.)
k:
SDRmn[15:9] + 1
Nfr:
1 data frame length [bits]
= (Start bit) + (Data length) + (Parity bit) + (Stop bit)
Remark
m: Unit number (m = 0, 1), n: Channel number (n = 3), mn = 03, 13, q: UART number (q = 1, 3)
Figure 14 - 87 Permissible Baud Rate Range for Reception (1 Data Frame Length = 11 Bits)
As shown in Figure 14 - 87, the timing of latching receive data is determined by the division ratio set by bits 15 to
9 of serial data register mn (SDRmn) after the start bit is detected. If the last data (stop bit) is received before this
latch timing, the data can be correctly received.
(Maximum receivable baud rate) =
2 × k × Nfr
2 × k × Nfr
−
k + 2
× Brate
(Minimum receivable baud rate) =
2 × k × (Nfr
−
1)
2 × k × Nfr
−
k
−
2
× Brate
FL
1 data frame (11 × FL)
Data frame length
of SAU
Permissible minimum
data frame length
Permissible maximum
data frame length
Latch
timing
Start
bit
Bit 0
Bit 1
Bit 7
Stop
bit
Parity
bit
Stop
bit
Parity
bit
Start
bit
Bit 0
Bit 1
Bit 7
Start
bit
Bit 0
Bit 1
Bit 7
Stop
bit
Parity
bit
(11 × FL) min.
(11 × FL) max.
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