Fujitsu FR81S User Manual

CHAPTER 44: 12-BIT A/D CONVERTER 

 

 

5. Operation 

 

FUJITSU SEMICONDUCTOR LIMITED 

 : 12-BIT A/D CONVERTER 

FUJITSU SEMICONDUCTOR CONFIDENTIAL 

93 

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. 



 

When the same activation factor as scan conversion target is set to the activation channel that is larger 

than the final channel of stop scan conversion, the activation channel that is larger than the final channel 

can execute the A/D conversion only for the stop period. 



 

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 starting the next scan conversion. The activation channel in the state of the data 

protection does not execute the A/D conversion. 

 

Figure 5-17 Stop scan conversion when conversion count of each channel is specified (In 

case of data protection function invalid) 

During 

conversion(N ch)

(The first)

During 

conversion(N+1 

ch)

(The first)

During 

conversion(N+2 

ch)

(The second)

During 

conversion(N+2 

ch)

(The first)

Conversion frequency 
completion flag
(ADEOCF.ECOF

N

)

Invalid data

Conversion 

result(The first)

Conversion result(The second)

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)

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)

When the final start channel processing to 

be scanned is completed, the scanning 

conversion is dormant. 

stop

Software factor start (N, 

N+1 and N+2 channels 

simultaneous)

Rest

← Factor clear

Software factor start 

(individual or plurals of N, 

N+1, and N+2)

The scanning conversion is restarted by 

the start demand generation. 

During 

conversion(N 

ch)

(The first)

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. 

[Channel composition information]

　　

Start channel N, N+1, and N+2: the repetition mode, the protection function none, the software start, the stop scanning conversion 

mode, the conversion frequency specification scanning conversion execution permission, and the continuous conversion frequency: Start 

channel N+2 = twice start channel N+1 = once start channel N= twice

 

MN705-00010-1v0-E

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