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Fujitsu FR81S User Manual

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CHAPTER 44: 12-BIT A/D CONVERTER 
 
 
5. Operation 
 
FUJITSU SEMICONDUCTOR LIMITED 
CHAPTER
 : 12-BIT A/D CONVERTER 
FUJITSU SEMICONDUCTOR CONFIDENTIAL 
91 
 
In case of data protection function invalid (ADTCS.PRT="0") 
The A/D conversion is continuously executed without stop. The data of the A/D conversion data is not 
protected, and. the last A/D conversion data converted in the activation channel is stored. 
 
In case of data protection function effective (ADTCS.PRT="1") 
The data of the A/D conversion data is protected. Therefore, the A/D conversion in the same activation 
channel stops the A/D conversion for the data protection period. However, when the scan conversion 
shifts to a different activation channel, the A/D conversion is continuously executed without stopping 
because A/D data register (ADTCD) is also different. 
Notes: 
 
In the continuous scan conversion, it is cleared automatically immediately to "0" though the conversion 
count completion flag (ADEOCF.EOCF) of the last activation channel of the scan conversion target is 
set in "1". 
 
When the same activation factor as scan conversion target is set to the activation channel that is larger 
than the final channel of continuous scan conversion, the activation channel that is larger than the final 
channel is evaluated once by the A/D activation arbitration of latter part after completing the final 
channel of the continuous scan conversion. 
 
The data protection function works at factors other than compare match activation 
(ADTECS.STS2="0", ADTCS.STS1,STS0="11
B
"). 
 
In the data protection function is effective (ADTCS.PRT="1"), please release the state of the data 
protection before executing the next scan conversion repeatedly. The activation channel in the state of 
the data protection does not execute the A/D conversion. 
 
Figure 5-15 Continuous scan conversion when conversion count of each channel is specified 
(In case of data protection function invalid) 
stop
During 
conversion(N ch)
(The first)
During 
conversion(N ch)
(The second)
During 
conversion(N+1 
ch)
(The first)
During 
conversion(N+2 
ch)
(The second)
During 
conversion(N+2 
ch)
(The first)
During 
conversion(N ch)
(The first)
Conversion frequency 
completion flag
(ADEOCF.ECOF
N
)
Invalid data
Conversion result 
(the first)
Conversion result (the second)
Conversion result 
(the first)
Invalid data
Conversion result (the first)
Invalid data
Conversion result (the second)
Conversion result 
(the first)
Software Activate 
request (n+1 channel)
A/D conversion
Activation trigger
Software Activate 
request (n channel)
Software Activate 
request (n+2 channel)
During 
conversion(N ch)
(The second)
Software factor start (N, N+1 and 
N+2 channels simultaneous)
Conversion frequency 
completion flag
(ADEOCF.ECOF
N+1
)
Conversion frequency 
completion flag
(ADEOCF.ECOF
N+2
)
Protection state flag
(ADPRT.PRTF
N
)
Protection state flag
(ADPRT.PRTF
N+1
)
Protection state flag
(ADPRT.PRTF
N+2
)
A/D data register
(ADTCD
N
.D11～D0)
A/D data register
(ADTCD
N+1
.D11～D0)
A/D data register
(ADTCD
N+2
.D11～D0)
Scanning conversion completion 
interruption factor flag
(ADSCANS.SCINT)
← Factor clear
When the analog to digital conversion of a specified frequency is 
completed, the activate request of the mask doing and the next start 
channel outputs the activate request. 
When the final start channel processing to be 
scanned is completed, it is automatically an iterative 
implementation from the beginning as for the 
scanning conversion. 
[Channel composition information]
　　
Start channel N, N+1, and N+2: Repetition mode, protection function none, software start, continuous scanning conversion mode, and 
conversion frequency specification scanning conversion execution permission
The continuous conversion frequency: Start channel N+2 = twice start channel N+1 = once start channel N= twice
 
MB91520 Series
MN705-00010-1v0-E
1894