參數(shù)資料
型號(hào): SAF-C513A-HN
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, EEPROM, 8 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 90/128頁
文件大?。?/td> 1837K
代理商: SAF-C513A-HN
On-Chip Peripheral Units
Semiconductor Group
6-31
6.3.3.1 Using Timer 1 to Generate Baud Rates
When timer 1 is used as the baud rate generator, the baud rates in modes 1 and 3 are determined
by the timer 1 overflow rate and the value of SMOD as follows:
Modes 1,3 baud rate = 2SMOD/32
×(timer 1 overflow rate)
The timer 1 interrupt should be disabled in this application. The timer itself can be configured for
either "timer" or "counter" operation, and in any of its 3 running modes. In the most typical
applications, it is configured for "timer" operation, in the auto-reload mode (high nibble of
TMOD=0010B). In that case, the baud rate is given by the formula
Modes 1,3 baud rate = (2SMOD/32
) × (f
OSC/(12×(256–TH1)))
One can achieve very low baud rates with timer 1 by leaving the timer 1 interrupt enabled, and
configuring the timer to run as a 16-bit timer (high nibble of TMOD = 0001B), and using the timer 1
interrupt to do a 16-bit software reload.
Table 6-7 lists commonly used baud rates and how they can be obtained from timer 1.
Table 6-7
Timer 1 Generated Commonly Used Baud Rates
Baud Rate
f
OSC
SMOD
Timer 1
C/T
Mode
Reload
Value
Mode 0 max: 640 kHz
Mode 2 max: 240 K
Modes 1, 3: 40 K
19.2 K
9.6 K
4.8 K
2.4 K
1.2 K
Mode 0 max : 1 MHz
Mode 2 max : 375 K
Mode 1,3 : 62.5 K
19,2 K
9.6 K
4.8 K
2.4 K
1.2 K
110
7.68 MHz
12 MHz
11.059 MHz
6 MHz
12 MHz
X
1
0
X
1
0
X
0
X
0
X
2
X
2
1
X
FFH
FEH
FCH
F8H
EAH
X
FFH
FDH
FAH
F4H
E8H
72H
FEEBH
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