CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
438
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 at 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 10-12. Baud Rate Generator 0 (BRG0) Configuration
f
XX
/2
f
XX
/4
f
XX
/8
f
XX
/16
f
XX
/32
f
XX
/64
f
XX
/128
f
XX
/256
f
XX
/512
f
XX
/1024
f
XX
/2048
Base clock
(f
CLK
)
Selector
UARTCAE0
8-bit counter
Match detector
Baud rate
BRGC0: MDL7 to MDL0
1/2
UARTCAE0 and TXE0 (or RXE0)
CKSR0: TPS3 to TPS0
f
XX
Remark
f
XX
: Internal system clock
(a) Base clock
When 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,
and its frequency is referred to as f
CLK
. When UARTCAE0 bit = 0, the base clock is fixed at low level.
Содержание V850E/IA1 mPD703116
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