User’s Manual U11969EJ3V0UM00
291
CHAPTER 8 SERIAL INTERFACE FUNCTION
Actual baud rate (baud rate with error)
Desired baud rate (normal baud rate)
(c) Error of baud rate
The error of the baud rate is calculated as follows:
Error [%] = – 1 x 100
Example: (9520/9600 – 1) x 100 = –0.833 [%]
(5000/4800 – 1) x 100 = +4.167 [%]
(2) Allowable error range of baud rate
The allowable error range depends on the number of bits of one frame.
The basic limit is
±
5% of baud rate error and
±
4.5% of sample timing with an accuracy of 16 bits. However,
the practical limit should be
±
2.3 % of baud rate error, assuming that both the transmission and reception sides
contain an error.
8.5.2 Baud rate generator compare registers 0 to 3 (BRGC0 to BRGC3)
These are 8-bit compare registers that set a timer/count value for the dedicated baud rate generator.
These registers can be read/written in 8- or 1-bit units.
Caution
The internal timer (TMBRGn) is cleared by writing the BRGC registers. Therefore, do not
rewrite or program the BRGCn registers during transmission/reception operation.
Remark
n = 0 to 3
Address
FFFFF084H
7
BRG07
BRGC0
6
BRG06
5
BRG05
4
BRG04
3
BRG03
2
BRG02
1
BRG01
0
BRG00
After reset
Undefined
Address
FFFFF094H
After reset
Undefined
Address
FFFFF0A4H
After reset
Undefined
Address
FFFFF0B4H
After reset
Undefined
BRG17
BRGC1
BRG16
BRG15
BRG14
BRG13
BRG12
BRG11
BRG10
BRG27
BRGC2
BRG26
BRG25
BRG24
BRG23
BRG22
BRG21
BRG20
BRG37
BRGC3
BRG36
BRG35
BRG34
BRG33
BRG32
BRG31
BRG30
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