參數(shù)資料
型號: SAL-XC866L-4FRA
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 75 MHz, MICROCONTROLLER, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁數(shù): 85/113頁
文件大?。?/td> 2289K
代理商: SAL-XC866L-4FRA
SAL-XC866
Functional Description
PRELIMINARY
Data Sheet
69
V1.0, 2011-02
8-bit reload value (BR_VALUE) for the baud rate timer defined by register BG
The following formulas calculate the final baud rate without and with the fractional divider
respectively:
The maximum baud rate that can be generated is limited to fPCLK/32. Hence, for a module
clock of 25 MHz, the maximum achievable baud rate is 0.78 MBaud.
Standard LIN protocol can support a maximum baud rate of 20kHz, the baud rate
accuracy is not critical and the fractional divider can be disabled. Only the prescaler is
used for auto baud rate calculation. For LIN fast mode, which supports the baud rate of
20kHz to 115.2kHz, the higher baud rates require the use of the fractional divider for
greater accuracy.
Table 25 lists the various commonly used baud rates with their corresponding parameter
settings and deviation errors. The fractional divider is disabled and a module clock of
25 MHz is used.
The fractional divider allows baud rates of higher accuracy (lower deviation error) to be
generated. Table 26 lists the resulting deviation errors from generating a baud rate of
115.2 kHz, using different module clock frequencies. The fractional divider is enabled
(fractional divider mode) and the corresponding parameter settings are shown.
Table 25
Typical Baud rates for UART with Fractional Divider disabled
Baud rate
Prescaling Factor
(2BRPRE)
Reload Value
(BR_VALUE + 1)
Deviation Error
19.2 kBaud
1 (BRPRE=000B)
81 (51H)-0.47 %
9600 Baud
1 (BRPRE=000B)162 (A2H)-0.47 %
4800 Baud
2 (BRPRE=001B)162 (A2H)-0.47 %
2400 Baud
4 (BRPRE=010B)162 (A2H)-0.47 %
baud rate
f
PCLK
16
2
BRPRE
BR_VALUE
1
+
()
×
----------------------------------------------------------------------------------- where 2
BRPRE
BR_VALUE
1
+
() 1
>
×
=
baud rate
f
PCLK
16
2
BRPRE
BR_VALUE
1
+
()
×
-----------------------------------------------------------------------------------
STEP
256
---------------
×
=
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