Conversion Data Protection Function - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 15 A/D CONVERTER

15.4 Conversion Data Protection Function

This A/D converter has the conversion data protection function and features the ability
to perform successive conversion using the EI
data.
■ Conversion Data Protection Function
Because there is only one conversion data register, when successive A/D conversion is
performed, the conversion data is stored upon completion of each conversion and the previous
data is lost. To protect the previous data, this A/D converter pauses without storing new
conversion data unless the previous data has been transferred to memory by the EI
The A/D converter is released from the pause when the previous data is transferred to memory
by the EI
The A/D converter continues its operation without pause so long as the previous data is
transferred to memory.
Notes:
• This function is applied to the INT and INTE bits in the ADCS1 register.
• The data protection function works only when the interrupt is allowed (INTE = 1).
This function does not work when the interrupt is not allowed (INTE = 0). Therefore, in
successive A/D conversion, new conversion data is stored successively in the register,
destroying previous data.
• Also, the INT bit is not cleared if the EI
In this case, the data protection function works and the A/D suspends the conversion. The
suspension is released by clearing the INT bit in the interrupt sequence.
• If the interrupt is prohibited when the A/D is suspended during EI
conversion starts and the new data may be written before the previous data is transferred.
Also, the standby data is destroyed if the A/D is restarted during a suspension (pause).
250
2
OS.
2
OS and to secure multiple pieces of
2
OS is not used when the interrupt is allowed (INTE = 1).
2
OS.
2
OS operation, the A/D