參數(shù)資料
型號： MC72000
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： Integrated Bluetooth Radio
中文描述： 集成藍牙無線
文件頁數(shù)： 52/156頁
文件大?。?/td> 1782K
代理商： MC72000
52
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
MOTOROLA
Hardware Functional Description
7.2.3 Fractional Divider
The high-speed UART is clocked with the IP bus clock (in the MC72000 typically 24 MHz). This high
frequency clock plus an internal fractional divider enables a wide range of frequencies that is calculated
using the following equations:
In 16 times oversampling mode (xTIM=0 in the UART control register), the following equation is used to
calculate the baud rate.
In 8 times oversampling mode (xTIM=1 in the UART control register), the following equation is used to
calculate the baud rate.
The internal baud rate generator is shown in Figure 31.
Figure 31. UART Baud Rate Generator
Values for INC and MOD that yield standard baud rates at an input clock of 24 MHz/12 MHz are shown in
Table 26.
audrateX16
ipsclk
INC
MOD
1
+
-------------------
×
=
baudrate
baudrateX16
16
---------------------------------
=
baudrateX8
ipsclk
INC
MOD
1
+
-------------------
×
=
baudrate
baudrateX8
8
------------------------------
=
Fractional Divider
Baud Rate
Sample Clock
IPG_CLK
UBRMOD
UBRINC
Divide by 8 or 16
F
For More Information On This Product,
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