Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 17 ASYNCHRONOUS SERIAL INTERFACE C (UARTC)
R01UH0042EJ0500 Rev.5.00 Page 759 of 1513
Aug 12, 2011
Therefore, the maximum baud rate that can be received by the destination is as follows.
BRmax = (FLmin/11)
−
1
= Brate
Similarly, obtaining the following maximum allowable transfer rate yields the following.
× FLmax = 11 × FL − × FL = FL
FLmax = FL × 11
Therefore, the minimum baud rate that can be received by the destination is as follows.
BRmin = (FLmax/11)
−
1
= Brate
Obtaining the allowable baud rate error for UARTCn and the destination from the above-described equations for
obtaining the minimum and maximum baud rate values yields the following.
Table 17-5. Maximum/Minimum Allowable Baud Rate Error
Division Ratio (k) Maximum Allowable Baud Rate Error Minimum Allowable Baud Rate Error
4 +2.32% −2.43%
8 +3.52% −3.61%
20 +4.26% −4.30%
50 +4.56% −4.58%
100 +4.66% −4.67%
255 +4.72% −4.72%
Remarks 1. The reception accuracy depends on the bit count in 1 frame, the input clock
frequency, and the division ratio (k). The higher the input clock frequency and
the larger the division ratio (k), the higher the accuracy.
2. k: Set value of UCnCTL2.UCnBRS7 to UCnCTL2.UCnBRS0 bits (n = 0 to 4)
10
11
k + 2
2 × k
21k − 2
2 × k
21k − 2
20
k
22k
21k + 2
20k
21k − 2