sak-xc888clm-8ffa Infineon Technologies Corporation, sak-xc888clm-8ffa Datasheet - Page 79

• Manufacturer Part Number: sak-xc888clm-8ffa
• Description: High Performance 8-bit Microcontroller With On-chip Flash Memory And Can
• Manufacturer: Infineon Technologies Corporation

3.11.1
Both UART modules have their own dedicated baud-rate generator, which is based on
a programmable 8-bit reload value, and includes divider stages (i.e., prescaler and
fractional divider) for generating a wide range of baud rates based on its input clock
f
Figure 31
The baud rate timer is a count-down timer and is clocked by either the output of the
fractional divider (f
output of the prescaler (f
generation, the fractional divider must be configured to fractional divider mode
(FDCON.FDM = 0). This allows the baud rate control run bit BCON.R to be used to start
or stop the baud rate timer. At each timer underflow, the timer is reloaded with the 8-bit
reload value in register BG and one clock pulse is generated for the serial channel.
Enabling the fractional divider in normal divider mode (FDEN = 1 and FDM = 1) stops the
baud rate timer and nullifies the effect of bit BCON.R. See
The baud rate (f
• Input clock f
• Prescaling factor (2
Data Sheet
Prelimary
PCLK
f
PCLK
, see
Prescaler
Figure
Baud-Rate Generator
FDEN
FDM
Baud-rate Generator Circuitry
PCLK
f
DIV
BR
31.
) value is dependent on the following parameters:
MOD
clk
BRPRE
) if the fractional divider is enabled (FDCON.FDEN = 1), or the
DIV
Fractional Divider
) if the fractional divider is disabled (FDEN = 0). For baud rate
Adder
FDRES
1
) defined by bit field BRPRE in register BCON
1
FDSTEP
0
f
MOD
‘0’
f
DIV
0
(overflow)
75
FDEN&FDM
10
11
01
00
10
00
01
11
R
0
1
Section
NDOV
8-Bit Baud Rate Timer
Functional Description
8-Bit Reload Value
3.12.
XC886/888CLM
V0.1, 2006-02
f
BR