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CHAPTER 13 8/10-bit A/D converter
13.5.5
A/D-converted Data Protection Function
A/D conversion with the output an interrupt request enabled activates the A/D
conversion data protection function.
I A/D-converted Data Protection Function in 8-/10-bit A/D Converter
The 8-/10-bit A/D converter has only one A/D data register (ADCR) for holding A/D-converted data.
When the results of A/D conversion are determined upon completion, data in the A/D data register is
updated.Therefore, the A/D conversion results may be lost if the A/D conversion results already stored are
not read before data in the A/D data register is rewritten.The A/D-converted data protection function in the
8-/10-bit A/D converter is activated to prevent data loss. This function automatically causes A/D
conversion to pause when an interrupt request is generated (ADCS: INT = 1) with an interrupt request
enable
G
A/D-converted data protection function when EI
• When the A/D conversion results are stored in the A/D data register (ADCR) after the analog input is A/
D-converted, the interrupt request flag bit in the A/D control status register (ADCS: INT) is set to "1".
• A/D conversion pauses for data protection while the interrupt request flag bit in the A/D control status
register (ADCS: INT) is set.
• When the INT bit is set with an interrupt request from the A/D control status register enabled (ADCS:
INTE = 1), an interrupt request is generated.When the INT bit is cleared by the generated interrupt
processing, the pause of A/D conversion is cancelled.
G
A/D-converted data protection function when EI
• A/D conversion pauses for data protection while the EI
conversion results to memory from the A/D data register after A/D conversion.When A/D conversion
pauses, the pause flag bit in the A/D control status register (ADCS: PAUS) is set to "1".
• When the transfer of the A/D conversion results to memory by the EI
pause of A/D conversion is cancelled and the pause flag bit (ADCS: PAUS) is cleared to "0". If A/D
conversion is performed continuously, it is restarted.
376
2
OS not used
2
OS used
2
OS function is used to transfer the A/D
2
OS function is terminated, the
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