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(2) Dedicated baud rate generator 3 (BRG3)
BRG3 is configured of an 8-bit timer counter that generates the baud rate signal, a prescaler mode register 3
(PRSM3) that controls baud rate signal generation, a prescaler compare register 3 (PRSCM3) that sets the
value of the 8-bit timer counter, and a prescaler.
(a) Input clock
The internal system clock (f
(b) Prescaler mode register 3 (PRSM3)
The PRSM3 register controls generation of the CSI0 and CSI1 baud rate signals.
This register can be read/written in 8-bit or 1-bit units.
Cautions 1. Do not change the values of the BGCS1 and BGCS0 bits during transmission/
2. Set the PRSM3 register prior to setting the CSICAEn bit of the CSIMn register to 1
7
6
PRSM3
0
0
Bit position
Bit name
4
CE
1, 0
BGCS1,
BGCS0
510
CHAPTER 10 SERIAL INTERFACE FUNCTION
) is input to BRG3.
XX
reception operation.
(n = 0, 1).
5
4
0
CE
Enables baud rate counter operation.
0: Stop baud rate counter operation and fix baud rate output signal to 0.
1: Enable baud rate counter operation and start baud rate output operation.
Selects count clock for baud rate counter.
BGCS1
0
0
1
1
Remark f
: Internal system clock
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User's Manual U14492EJ5V0UD
3
2
1
0
0
BGCS1
BGCS0
Function
BGCS0
Count clock selection
f
/4
0
XX
f
/8
1
XX
f
/16
0
XX
f
/32
1
XX
0
Address
Initial value
FFFFF920H
00H
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