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參數資料
型號: Q67121C452
英文描述: IC-SM-8-BIT CPU-12MHZ
中文描述: 集成電路釤8位CPU - 12MHz的
文件頁數: 67/121頁
文件大小: 1000K
代理商: Q67121C452
Semiconductor Group
6-33
On-Chip Peripheral Components
C501
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 = 2
SMOD
/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 = 2
SMOD
/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: 1 MHz
Mode 2 max: 375 K
Modes 1, 3: 62.5 K
19.2 K
9.6 K
4.8 K
2.4 K
1.2 K
110
110
12 MHz
12 MHz
12 MHz
11.059 MHz
11.059 MHz
11.059 MHz
11.059 MHz
11.059 MHz
6 MHz
12 MHz
X
1
1
1
0
0
0
0
0
0
X
X
0
0
0
0
0
0
0
0
X
X
2
2
2
2
2
2
2
1
X
X
FFH
FDH
FDH
FAH
F4H
E8H
72H
FEEBH
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