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): 82/119頁
文件大?。?/td> 895K
代理商: XC888LM
XC886/888CLM
Functional Description
Data Sheet
Prelimary
78
V0.1, 2006-02
3.11.2
In UART modes 1 and 3 of UART module, Timer 1 can be used for generating the
variable baud rates. In theory, this timer could be used in any of its modes. But in
practice, it should be set into auto-reload mode (Timer 1 mode 2), with its high byte set
to the appropriate value for the required baud rate. The baud rate is determined by the
Timer 1 overflow rate and the value of SMOD as follows:
Baud Rate Generation using Timer 1
[3.1]
3.12
Normal Divider Mode (8-bit Auto-reload Timer)
Setting bit FDM in register FDCON to 1 configures the fractional divider to normal divider
mode, while at the same time disables baud rate generation (see
Figure 31
). Once the
fractional divider is enabled (FDEN = 1), it functions as an 8-bit auto-reload timer (with
no relation to baud rate generation) and counts up from the reload value with each input
clock pulse. Bit field RESULT in register FDRES represents the timer value, while bit
field STEP in register FDSTEP defines the reload value. At each timer overflow, an
overflow flag (FDCON.NDOV) will be set and an interrupt request generated. This gives
an output clock
f
MOD
that is 1/n of the input clock
f
DIV
, where n is defined by 256 - STEP.
The output frequency in normal divider mode is derived as follows:
[3.2]
Mode 1, 3 baud rate
2
SMOD
2
×
PCLK
256
32
TH1
(
)
×
------------------------------f
=
f
MOD
f
DIV
STEP
256
------------1
×
=
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