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參數(shù)資料
| 型號： | S1C6S460D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124 |
| 封裝： | 4.69 X 4.68 MM, DIE-124 |
| 文件頁數(shù)： | 35/107頁 |
| 文件大?。?/td> | 788K |
| 代理商： | S1C6S460D |
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S1C6S460 TECHNICAL MANUAL
EPSON
25
CHAPTER 5: OSCILLATION CIRCUIT
5.4 Operating Voltage Change
S1C6S460 can change OSC1 and OSC3 system clocks through the software. In this case, to obtain stable
operation, operating voltage VS1 of the internal circuit is changed through the software.
Likewise, when selecting OSC1 as the system clock, there is need to change operating voltage VS1 accord-
ing to the value of the power voltage (VDD–VSS).
Oscillation frequency and the corresponding operating voltage VS1 are shown in Table 5.4.1.
Table 5.4.1 Oscillation frequency and operating voltage
Oscillation frequency
Oscillation circuit
Operating voltage VS1
32.768 kHz
OSC1
-1.2 V or -2.1 V
1 MHz
OSC3
-2.1 V
2 MHz
OSC3
-3.0 V
The VDD reference voltage is used as the operating voltage VS1.
When OSC3 is to be used as the CPU system clock, change the operating voltage VS1 accordingly through
the software and then turn the OSC3 oscillation ON and switch the clock frequency.
If the OSC3 oscillation frequency is to be fixed around 1 MHz, set the operating voltage to -2.1 V; at 2
MHz, set the operating voltage to -3.0 V.
Moreover, when the CPU is to be operated with OSC1, set the operating voltage to -1.2 V if the power
voltage detected with the SVD circuit were less than 3.1 V (VDD–VSS < 3.1 V); set the operating voltage to
-2.1 V if the detected voltage were 3.1 V or more (VDD–VSS
≥ 3.1 V). However, it can be used fixed at -1.2
V (at OSC1 operation) for power whose initial value is 3.6 V or less as in lithium batteries.
Note: Switching VS1 when the power source voltage is lower than the set voltage may cause
misoperation. Perform the operating voltage only after making sure that power voltage by SVD is
more than the VS1 setting voltage (absolute value).
5.5 Clock Frequency and Instruction Execution Time
Table 5.5.1 shows the instruction execution time according to each frequency of the system clock.
Table 5.5.1 Clock frequency and instruction execution time
Clock frequency
Instruction execution time (s)
5-clock instruction 7-clock instruction 12-clock instruction
32.768 kHz
152.6
213.6
366.2
1 MHz
5.0
7.0
12.0
2 MHz
2.5
3.5
6.0
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