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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)： | 56/102頁(yè) |
| 文件大小： | 674K |
| 代理商： | S1C60L02 |
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S1C60N02 TECHNICAL MANUAL
EPSON
49
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (A/D Converter)
If the up-counter C0–C15 becomes "0000H" due to over-
flow, the sensor side of the oscillation circuit turns on,
and the up-counter starts counting up according to the
oscillation clock on the sensor side.
The up/down counter TC0–TC15 shifts to the counting-
down mode at this point and starts counting down from
the value measured as a result of oscillation by the
reference resistance.
Timing in starting counting when oscillation is switched,
is same as Figure 4.8.3.
When the up/down counter TC0–TC15 has counted down
to "0000H", the counting operation of both counters and
CR oscillation stops, and an interrupt occurs. At the
same time, the ADRUN register is set to "0", and the A/D
converter circuit stops operation completely.
The sensor is oscillated for the same period of time as the
reference resistance is oscillated after the up/down
counter TC0–TC15 is set to "0000H" prior to A/D conver-
sion. Therefore, the difference in oscillation frequency can
be measured from the values counted by the up-counter
C0–C15.
Since the reference resistance is oscillated until the up-
counter C0–C15 overflows, an appropriate initial value
needs to be set before A/D conversion is started. If a
smaller initial value is set, a longer counting period is
possible, thereby ensuring more accurate detection.
Likewise, if the input clock of the up/down counter TC0–
TC15 is set at 65 kHz, the degree of precision is reduced.
However, since CR oscillation frequency is normally set
lower than the clock frequency of the up/down counter
TC0–TC15 to ensure accurate measurement, the up/
down counter TC0–TC15 may overflow while counting the
oscillation frequency of the reference resistance.
If an overflow occurs, CR oscillation and A/D conversion
is terminated immediately. Also in such cases, the up/
down counter indicates "0000H", and interrupt occurs.
However, it is impossible to judge whether the interrupt
has occurred due to an overflow or normal termination.
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