Baud Rate Generator Compare Registers 0 To 3 (Brgc0 To Brgc3) - NEC V854 UPD703006 User Manual

(c) Error of baud rate
The error of the baud rate is calculated as follows:
Actual baud rate (baud rate with error)
Error [%] =
Desired baud rate (normal baud rate)
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.
7 6
BRGC0 BRG07 BRG06
BRGC1 BRG17 BRG16
BRGC2 BRG27 BRG26
BRGC3 BRG37 BRG36
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
CHAPTER 8 SERIAL INTERFACE FUNCTION
5 4 3
BRG05 BRG04 BRG03 BRG02
BRG15 BRG14 BRG13 BRG12
BRG25 BRG24 BRG23 BRG22
BRG35 BRG34 BRG33 BRG32
User's Manual U11969EJ3V0UM00
– 1 x 100
2 1 0
BRG01 BRG00
FFFFF084H
BRG11 BRG10
FFFFF094H
BRG21 BRG20
FFFFF0A4H
BRG31 BRG30
FFFFF0B4H
Address After reset
Undefined
Address After reset
Undefined
Address After reset
Undefined
Address After reset
Undefined
291