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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
13.3.6 Dedicated baud rate generators 0, 1 (BRG0, BRG1)
(1)
Selecting the baud rate generator
The CSI00 to CSI02 serial clocks can be selected between dedicated baud rate generator output
or internal peripheral clock (f
PCLK
).
The serial clock source is specified by bits CKS2 to CKS0 of registers CSIC0 and CSIC1 (refer to
12.3.3 (2) Clocked serial interface clock selection registers 0, 1 (CSIC0, CSIC1)).
If the dedicated baud rate generator output is specified, BRG0 or BRG1 respectively is selected as
the clock source.
Since the same serial clock can be shared for transmission and reception, baud rate is the same
for the transmission/reception.
Figure 13-42:
Baud Rate Generators 0, 1 (BRG0, BRG1) Block Diagram
Remarks: 1. f
PCLK
: internal peripheral clock
2. n = 0 to 2
BGCS1, BGCS0
PRSCMn
Match detector
1/2
CSI0n
8-bit timer counter
Selector
/2
f
PCLK
/4
f
PCLK
/8
f
PCLK
/16
f
PCLK
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