Dedicated Baud Rate Generator 0 (Brg0) - NEC UPD703116 User Manual

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
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 /1024
XX
f /2048
XX
CKSR0: TPS3 to TPS0
Remark f : Internal system clock
XX
(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
(f ). When UARTCAE0 bit = 0, f
CLK
434
CHAPTER 10 SERIAL INTERFACE FUNCTION
Figure 10-12. Baud Rate Generator 0 (BRG0) Configuration
UARTCAE0
UARTCAE0 and TXE0 (or RXE0)
Base clock
Selector
(f )
CLK
BRGC0: MDL7 to MDL0
is fixed at low level.
CLK
User's Manual U14492EJ5V0UD
8-bit counter
Match detector
1/2
Baud rate