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參數(shù)資料
| 型號(hào)： | S1C60L02 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.08 MHz, MICROCONTROLLER, PQFP60 |
| 文件頁(yè)數(shù)： | 54/102頁(yè) |
| 文件大?。?/td> | 674K |
| 代理商： | S1C60L02 |
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S1C60N02 TECHNICAL MANUAL
EPSON
47
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (A/D Converter)
(2) Oscillation circuit
The CR oscillation circuit is designed so that either the
reference resistance side or the sensor side can be oper-
ated independently by the oscillation control circuit.
A/D conversion begins when "1" is written in the ADRUN
register (0F1H D0). At the same time, the oscillation
circuit also turns on. At first, the circuit of the reference
resistance side (RS) is operated by the oscillation control
circuit. Then, the circuit of the sensor side (TH) turns on
when counting by the oscillation clock of the reference
resistance is terminated.
Each circuit performs the same oscillating operation as
follows:
The Tr1 (Tr2) turns on first, and the condenser connected
between the CS and VSS terminals is charged through the
reference resistance (sensor). If the voltage level of the CS
terminal decreases, the Tr1 (Tr2) turns off and the Tr3
turns on. As a result, the condenser becomes discharged,
and oscillation is performed according to CR time con-
stant. The time constant changes as the sensor resist-
ance value fluctuates, producing a difference from the
oscillation frequency of the reference resistance.
Oscillation waveforms are shaped by the Schmitt trigger
and transmitted to counter. The clock transmitted to the
counter is also output from the ADOUT terminal. As a
result, oscillation frequency can be identified by the
oscilloscope. Since this monitor has no effect on oscilla-
tion frequency, it can be used to adjust CR oscillation
frequency.
Oscillation waveforms and waveforms output from the
ADOUT terminal are shown in Figure 4.8.2.
Fig. 4.8.2
Oscillation waveforms
CS terminal
ADOUT
VDD
VSS
VDD
VSS
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| S1C60N08 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
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