384
Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
13.2.6 Dedicated baud rate generators (BRG) of UART5n (n = 0, 1)
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 UART5n (n = 0, 1). 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 configuration
Figure 13-16:
Baud Rate Generator (BRG) Configuration of UART5n (n = 0, 1)
Remark:
n = 0, 1
(a) Basic clock (Clock)
When Power bit = 1 in the ASIMn register, the clock selected according to the TPS3 to TPS0 bits
of the CKSRm register is supplied to the transmission/reception unit. This clock is called the basic
clock (Clock), and its frequency is referred to as f
CLK
. When Power bit = 0, Clock is fixed at low
level.
Clock
Selector
CAE
8-bit counter
Match detector
Baud rate
BRGC5n: MDL7 to MDL0
1/2
CAE and TXE (or RXE)
CKSR5n: TPS3 to TPS0
/2048
f
PCLK
/1024
f
PCLK
/512
f
PCLK
/256
f
PCLK
/128
f
PCLK
/64
f
PCLK
/32
f
PCLK
/16
f
PCLK
/8
f
PCLK
/4
f
PCLK
/2
f
PCLK
f
PCLK
(f
CLK
)
Содержание mPD703128
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