Dedicated Baud Rate Generator N (Brgn) - NEC V850ES/SA2 UPD703201 Manual

12.2.6 Dedicated baud rate generator n (BRGn)

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 UARTn. 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 n (BRGn) configuration
Figure 12-14. Configuration of Baud Rate Generator n (BRGn)
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
TOm output
CKSRn: TPS3 to TPS0
Remark f : Internal system clock
XX
n = 0, 1
m = 4, 5 (m = 4 when n = 0, m = 5 when n = 1)
(a) Base clock (Clock)
When the UARTCAEn bit = 1 in the ASIMn register, the clock selected according to the TPSn3 to TPSn0
bits of the CKSRn register is supplied to the transmission/reception unit. This clock is called the base
clock (Clock), and its frequency is referred to as f
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CHAPTER 12 SERIAL INTERFACE FUNCTION
UARTCAEn
UARTCAEn and TXEn (or RXEn)
Clock
Selector
(f )
CLK
BRGCn: MDL7 to MDL0
Preliminary User's Manual U15905EJ1V0UD
8-bit counter
Match detector 1/2
. When UARTCAEn = 0, Clock is fixed to low level.
CLK
Baud rate