NEC V850E/MA1, User Manual

Page: 384 / 567

CHAPTER 11 SERIAL INTERFACE FUNCTION
384
User’s Manual U14359EJ4V0UM
(b) Baud rate generator control registers 0 to 2 (BRGC0 to BRGC2)
The BRGCn register is an 8-bit register that controls the baud rate (serial transfer speed) of UARTn.
These registers can be read or written in 8-bit units.
Caution If the BRGn7 to BRGn0 bits are to be overwritten, TXEn and RXEn should be set to 0
in the ASIMn register first (n = 0 to 2).
7 6 5 4 3 2 1 0 Address After reset
BRGC0 MDL07 MDL06 MDL05 MDL04 MDL03 MDL02 MDL01 MDL00 FFFFFA07H FFH
BRGC1 MDL17 MDL16 MDL15 MDL14 MDL13 MDL12 MDL11 MDL10 FFFFFA17H FFH
BRGC2 MDL27 MDL26 MDL25 MDL24 MDL23 MDL22 MDL21 MDL20 FFFFFA27H FFH
Bit position Bit name Function
Specifies the 8-bit counter’s divisor value.
B R G n 7 B R G n 6 B R G n 5 B R G n 4 B R G n 3 B R G n 2 B R G n 1 B R G n 0 Divisor
value (k)
Serial clock
0 0 0 0 0 x x x
−
Setting
prohibited
0 0 0 0 1 0 0 0 8 f
XCLK
/8
0 0 0 0 1 0 0 1 9 f
XCLK
/9
0 0 0 0 1 0 1 0 10 f
XCLK
/10
1 1 1 1 1 0 1 0 250 f
XCLK
/250
1 1 1 1 1 0 1 1 251 f
XCLK
/251
1 1 1 1 1 1 0 0 252 f
XCLK
/252
1 1 1 1 1 1 0 1 253 f
XCLK
/253
1 1 1 1 1 1 1 0 254 f
XCLK
/254
1 1 1 1 1 1 1 1 255 f
XCLK
/255
7 to 0
BRGn7 to
BRGn0
(n = 0 to 2)
Remarks 1. f
XCLK
: Frequency of clock selected according to TPSn3 to TPSn0 bits of CKSRn register.
2. k: Value set according to BRGn7 to BRGn0 bits (k = 8, 9, 10, ..., 255)
3. x: don’t care
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