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CHAPTER 20 UART2, UART3
20.4.7
Baud Rate Generator Register 0 and 1 (BGR02/03 and
BGR12/13)
The baud rate generator registers 0 and 1 (BGR02/03 and BGR12/13) set the division
ratio for the serial clock. Also the actual count of the transmission reload counter can
be read.
■ Bit Configuration of Baud Rate Generator Register (BGR02/03 and BGR12/13)
Figure 20.4-8 shows the bit configuration of the baud rate generator register (BGR02/03 and BGR12/13).
Figure 20.4-8 Bit Configuration of Baud Rate Generator Register (BGR02/03 and BGR12/13)
bit
Address:
BGR03: 00351E
H
BGR13: 00351F
H
BGR02: 0035DE
H
BGR12: 0035DF
H
R/W
:
Readable and writable
R
:
Read onl
:
Undefined bit
-
The baud rate generator register sets the division ratio of the serial clock. The BGR12/13 and BGR02/03
correspond to the upper byte and lower byte, respectively, and writing of counter reload value and reading
of transmission reload counter value is allowed.
Also, both registers can be read or written via byte or word access.
When writing reload value other than "0" to baud rate generator register, the reload counter starts counting.
364
15
14
13
12
11
10
R
R/W R/W R/W
R/W
R/W
R/W R/W
y
9
8
7
6
5
4
R/W R/W R/W
R/W
R/W
bit7 to bit0
BGR7 to BGR0
write
Write bit 7 to 0 of reload value to counter
read
Read bit 7 to 0 of transmission reload counter
bit14 to bit8
BGR14 to BGR8
write
Write bit 14 to 8 of reload value to counter
read
Read bit 14 to 8 of transmission reload counter
bit15
"0" is read.
read
Initial value
3
2
1
0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
R/W R/W R/W
Baud rate Generator Register 02,03
Baud rate Generator Register 12,13
Undefined bit
B
B
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