參數(shù)資料
型號: SAA-XC886LM-6FFA5V
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 96 MHz, MICROCONTROLLER, PQFP48
封裝: GREEN, PLASTIC, TQFP-48
文件頁數(shù): 126/134頁
文件大?。?/td> 4390K
代理商: SAA-XC886LM-6FFA5V
SAA-XC886CLM
Functional Description
Data Sheet
84
V1.1, 2010-08
The following formulas calculate the final baud rate without and with the fractional divider
respectively:
(3.5)
(3.6)
The maximum baud rate that can be generated is limited to
f
PCLK/32. Hence, for a module
clock of 24 MHz, the maximum achievable baud rate is 0.75 MBaud.
Standard LIN protocol can support a maximum baud rate of 20 kHz, 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
20 kHz to 115.2 kHz, the higher baud rates require the use of the fractional divider for
greater accuracy.
Table 29 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
24 MHz is used.
The fractional divider allows baud rates of higher accuracy (lower deviation error) to be
generated. Table 30 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 29
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=000
B)
78 (4E
H)0.17 %
9600 Baud
1 (BRPRE=000
B)
156 (9C
H)0.17 %
4800 Baud
2 (BRPRE=001
B)
156 (9C
H)0.17 %
2400 Baud
4 (BRPRE=010
B)
156 (9C
H)0.17 %
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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