Fujitsu FR81S Manuale Utente
CHAPTER 44: 12-BIT A/D CONVERTER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 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.
Notes:
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
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
completion flag
(ADEOCF.ECOF
N+1
)
Conversion frequency
completion flag
(ADEOCF.ECOF
completion flag
(ADEOCF.ECOF
N+2
)
Protection state flag
(ADPRT.PRTF
(ADPRT.PRTF
N
)
Protection state flag
(ADPRT.PRTF
(ADPRT.PRTF
N+1
)
Protection state flag
(ADPRT.PRTF
(ADPRT.PRTF
N+2
)
A/D data register
(ADTCD
(ADTCD
N
.D11~D0)
A/D data register
(ADTCD
(ADTCD
N+1
.D11~D0)
A/D data register
(ADTCD
(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
MB91520 Series
MN705-00010-1v0-E
1896