參數(shù)資料
型號： XC888LM
廠商： INFINEON TECHNOLOGIES AG
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù)： 80/119頁
文件大?。?/td> 895K
代理商： XC888LM
XC886/888CLM
Functional Description
Data Sheet
Prelimary
76
V0.1, 2006-02
Fractional divider (STEP/256) defined by register FDSTEP
(to be considered only if fractional divider is enabled and operating in fractional divider
mode)
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
f
PCLK
/32. Hence, for a module
clock of 24 MHz, the maximum achievable baud rate is 0.75 MBaud.
Standard LIN protocal 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 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.
Table 29
Typical Baud rates for UART with Fractional Divider disabled
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.
Baud rate
Prescaling Factor
(2
BRPRE
)
1 (BRPRE=000
B
)
1 (BRPRE=000
B
)
2 (BRPRE=001
B
)
4 (BRPRE=010
B
)
Reload Value
(BR_VALUE + 1)
78 (4E
H
)
156 (9C
H
)
156 (9C
H
)
156 (9C
H
)
Deviation Error
19.2 kBaud
9600 Baud
4800 Baud
2400 Baud
0.17 %
0.17 %
0.17 %
0.17 %
baud rate
f
BR_VALUE
(
×
16
2
BRPRE
1
+
)
×
-----------------------------------------------------------------------------------
where 2
BRPRE
BR_VALUE
1
+
(
)
1
>
×
=
baud rate
f
BR_VALUE
(
×
16
2
BRPRE
1
+
)
×
-----------------------------------------------------------------------------------
256
STEP
×
=
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相關代理商/技術參數(shù)
參數(shù)描述
XC888LM6FFA5VACKXUMA1 制造商:Infineon Technologies AG 功能描述:MCU 8-bit XC800 8051 CISC 24KB Flash 2.5V/5V 64-Pin TQFP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT FLASH 64-LQFP
XC888LM6FFI3V3ACFXUMA1 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC 24KB FLASH 2.5V/3.3V 64-PIN TQFP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT 32KB FLASH 64TQFP
XC888LM8FFI5VACFXUMA1 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC 32KB FLASH 2.5V/5V 64-PIN TQFP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT FLASH 64-LQFP
XC88915TFN100 制造商:Motorola Inc 功能描述:
XC88916DW55 制造商:Motorola Inc 功能描述:
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