Fujitsu FR81S User Manual
CHAPTER 44: 12-BIT A/D CONVERTER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 12-BIT A/D CONVERTER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
88
5.2.12.
Protection function
The protection function is explained.
Each A/D data register can set the data protection function. The protection function is set by the PRT bit of
A/D activation trigger control status register (ADTCS). The protection function works at factors other than
compare match activation.
When the protection function is effective, the data becomes the protection state if the conversion result is
stored in the A/D data register. The condition that the state of the data protection is released can be selected
by the PRTS bit of the ADTCS register.
When the PRTS bit is "0", the activation request is masked until the data of the A/D data register is read
and the interrupt flag is cleared. The data reading and the interrupt flag clear are in random order.
When the PRTS bit is "1", the activation request is masked until the data of the A/D data register is
read.
When the state of data protection, even if the next activation factor is generated, the activation request
signal is masked (not active). Therefore, the data (read out not yet) of the A/D data register is not
over-written by the next A/D conversion data.
MB91520 Series
MN705-00010-1v0-E
1891