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10.2.6 Dedicated baud rate generator 0 (BRG0)
A dedicated baud rate generator, which consists of a source clock selector and an 8-bit programmable counter,
generates serial clocks during transmission/reception by UART0. The dedicated baud rate generator output can be
selected as the serial clock for each channel.
Separate 8-bit counters exist for transmission and for reception.
(1) Baud rate generator 0 (BRG0) configuration
Figure 10-13. Configuration of Baud Rate Generator 0 (BRG0)
f
XX
f
/2
XX
f
/4
XX
f
/8
XX
f
/16
XX
f
/32
XX
f
/64
XX
f
/128
XX
f
/256
XX
f
/512
XX
f
/1,024
XX
f
/2,048
XX
CKSR0: TPS3 to TPS0
Remark
f
: Internal system clock
XX
(a) Base clock (Clock)
When the UARTCAE0 bit = 1 in the ASIM0 register, the clock selected according to the TPS3 to TPS0
bits of the CKSR0 register is supplied to the transmission/reception unit. This clock is called the base
clock (f
). When UARTCAE0 = 0, f
CLK
CHAPTER 10 SERIAL INTERFACE FUNCTION
UARTCAE0
UARTCAE0 and TXE0 (or RXE0)
Clock
Selector
(f
)
CLK
BRGC0: MDL7 to MDL0
is fixed to low level.
CLK
User's Manual U15195EJ5V0UD
8-bit counter
Match detector
1/2
Baud rate
431
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