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CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
439
(3) Baud rate generator control registers 0 to 3 (BRGC0 to BRGC3)
These registers set the serial clock for UARTn.
BRGCn can be set by an 8-bit memory manipulation instruction.
RESET input sets these registers to 00H.
After reset:
00H
R/W
Address:
BRGC0: FFFFF304H
BRGC1: FFFFF314H
BRGC2: FFFFF234H
BRGC3: FFFFF2B4H
7
6
5
4
3
2
1
0
BRGCn
MDLn7
MDLn6
MDLn5
MDLn4
MDLn3
MDLn2
MDLn1
MDLn0
(n = 0 to 3)
MD
Ln7
MD
Ln6
MD
Ln5
MD
Ln4
MD
Ln3
MD
Ln2
MD
Ln1
MD
Ln0
Selection of input clock
k
0
0
0
0
0
×
×
×
Setting prohibited
−
0
0
0
0
1
0
0
0
f
SCK
/8
8
0
0
0
0
1
0
0
1
f
SCK
/9
9
0
0
0
0
1
0
1
0
f
SCK
/10
10
0
0
0
0
1
0
1
1
f
SCK
/11
11
0
0
0
0
1
1
0
0
f
SCK
/12
12
0
0
0
0
1
1
0
1
f
SCK
/13
13
0
0
0
0
1
1
1
0
f
SCK
/14
14
0
0
0
0
1
1
1
1
f
SCK
/15
15
0
0
0
1
0
0
0
0
f
SCK
/16
16
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
1
1
f
SCK
/255
255
Cautions 1. The value of BRGCn becomes 00H after reset. Before starting operation, select a setting
other than “Setting prohibited”. Selecting the “Setting prohibited” setting in stop mode
does not cause any problems.
2. If BRGCn is written during communication processing, the output of the baud rate
generator will be disturbed and communication will not be performed normally. Therefore,
do not write to BRGCn during communication processing.
Remark
f
SCK
: Source clock of 8-bit counter