參數(shù)資料
型號(hào)： TC9324F
廠(chǎng)商： Toshiba Corporation
英文描述： Single-Chip DTS Microcontroller (DTS-20)
中文描述： 單芯片微丘（丘- 20）
文件頁(yè)數(shù)： 46/101頁(yè)
文件大小： 1831K
代理商： TC9324F
TC9324F
2002-02-08
46
Reference Frequency Divider
When the 75-kHz oscillator clock is selected as a peripheral clock, the reference frequency divider divides
the frequency of the external 75-kHz crystal oscillator to generate seven PLL reference frequency signals: 1
kHz, 3 kHz, 3.125 kHz, 5 kHz, 6.25 kHz, 12.5 kHz, and 25 kHz. When the 4.5-MHz oscillator clock is
selected, the reference frequency divider divides the frequency of the external 4.5-MHz crystal oscillator to
generate a further four PLL reference frequency signals: 9 kHz, 10 kHz, 50 kHz, and 100 kHz, making a
total of 11 reference frequency signals. The frequency is selected by the reference port data.
The selected signal is supplied as the reference frequency for the phase comparator, which is described
next. The PLL is turned on and off according to the reference port setting.
. Reference Port
The reference port is an internal port used to select the reference frequency signal, and there are 11
available frequencies. This port is accessed by the OUT1 instruction with the operand [CN
=
6H] (L16P1)
on I/O map page 1. When the contents of the reference port are all 1, the programmable counter, IF counter,
reference counter, and phase comparator are all halted and the PLL is turned off. When the reference port
is set, the frequency setting data of the programmable counter are updated. Therefore, when setting the
reference port, be sure to first set the programmable counter frequency, then the reference port.
Y1
Y2
Y4
Y8
φ
L16P1
R0
R1
R2
R3
R3
R2
R1
R0
Reference
frequency
0
0
0
0
0
1 kHz
0
0
0
1
1
3 kHz
0
0
1
0
2
3.125 kHz
0
0
1
1
3
5 kHz
0
1
0
0
4
6.25 kHz
0
1
0
1
5
12.5 kHz
0
1
1
0
6
25 kHz
0
1
1
1
7
9 kHz
1
0
0
0
8
10 kHz
1
0
0
1
9
50 kHz
1
0
1
0
10
100 kHz
1
0
1
1
11
Prohibited
1
1
0
0
12
Prohibited
1
1
0
1
13
Prohibited
1
1
1
0
14
Prohibited
1
1
1
1
15
PLL off mode
Reference frequency selection
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