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CHAPTER 20 8/10-BIT A/D CONVERTER
20.6.2
A/D Conversion Data Protection Function
When A/D conversion is performed in the interrupt enabled state, the conversion data
protection function operates.
■
A/D Conversion Data Protection Function
The A/D converter has just one data register that holds conversion data. When a single A/D conversion is
completed, the data in the data register is rewritten.
If the conversion data were not transferred to memory before the next conversion data was stored, part of
the conversion data would be lost. The data protection function operates in the interrupt enabled state
(INTE = 1), as described below, to prevent loss of data.
●
Data protection function when
EI
2
OS
is not used
When conversion data is stored in the A/D data register (ADCR0/ADCR1), the INT bit of the A/D control
status register1 (ADCS1) is set to "1".
While the INT bit is "1", A/D conversion is halted.
Halt status is released when the INT bit is cleared after data in the A/D data register (ADCR0/ADCR1) has
been transferred to memory by the interrupt routine.
●
Data protection function when
EI
2
OS
is used
In continuous conversion using EI
2
OS, the PAUS bit of the A/D control status register1 (ADCS1) is kept at
"1" when a conversion ends. This status continues until EI
2
OS finishes transferring the conversion data
from the data register to memory. In the meantime, the A/D conversion is halted, and the next conversion
data is not stored. When the data transfer to memory is completed, the PAUS bit is cleared to "0" and
conversion resumes.
Figure 20.6-5 shows the operation flow of the data protection function when EI
2
OS is used.
Содержание MB90460 Series
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Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
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Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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