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
FUJITSU SEMICONDUCTOR CONFIDENTIAL
90
Note:
When the data protection function is effective (ADTCS.PRT="1") and it sets two or more repeat modes
(ADTCS.RPT="1"), the conversion of the activation channel with low priority is not executed if the state of
the data protection of the activation channel with high priority is released before converting the activation
channel with low priority.
(ADTCS.RPT="1"), the conversion of the activation channel with low priority is not executed if the state of
the data protection of the activation channel with high priority is released before converting the activation
channel with low priority.
Figure 5-14 Continuous scan conversion
Ø In case of data protection function invalid
The priority of the start factor is high, the start channel is treatable, and the conversion of other channels is not treatable
because the one of a small start channel number is given priority (In addition, the control of its.. priority is done if there is a start
factor with high priority).
factor with high priority).
Software Activate
request (n+1 channel)
request (n+1 channel)
A/D conversion
stop
Activation trigger
Software Activate
request (n channel)
request (n channel)
During conversion(N channel)
During conversion(N channel)
During conversion(N channel)
During conversion(N
channel)
Ø For a data protection function effective
Because the security function works, two or more channels can be converted though the one of the start channel number that
the priority of the start factor is high, and the start channel is small is given priority.
- When data register lead & interruption of the channel with high priority is cleared before the channel with low attention
priority is converted, the channel with low priority cannot be converted.
Software Activate
request (n+1 channel)
request (n+1 channel)
A/D conversion
stop
Activation trigger
Software Activate
request (n channel)
request (n channel)
During conversion(N channel)
During conversion(N+1 channel)
During conversion(N+2 channel)
stop
Software Activate
request (n+2 channel)
request (n+2 channel)
During
conversion(N
channel)
Data register N lead ( & interruption N clearness)
Data register N+1 lead ( & interruption N+1 clearness)
Data register N+2 lead ( & interruption N+2 clearness)
The mask does the activate request so that the
protection mode may work.
Software factor start (N and N+1
channels simultaneous)
channels simultaneous)
Software factor start (N,
N+1 and N+2 channels
simultaneous)
N+1 and N+2 channels
simultaneous)
Continuous scan conversion when conversion count of each channel is
specified
The continuous scan conversion when conversion count of each channel is specified is executed by the
continuous scan conversion mode is set (ADSCANS.SCMD="0"), the repeat conversion selection bit is set
to repeat mode (ADTCS.RPT="1"), the conversion count specification scan conversion execution enable
(ADNCS.CNTEN="1") is set, the conversion count specification (ADNCS.CCNT1,CCNT0="count") is set,
and the A/D activation is set to the same activation factor at the same time on each activation channel of the
scan conversion target.
The continuous scan conversion when conversion count of each channel is specified advances to the A/D
conversion of the next activation channel when the A/D conversion of conversion count specification
(ADNCS.CCNT1,CCNT0) is executed from activation channel (activation channel of the scan conversion
target) small number, and conversion is completed. Moreover, the activation channel that completes the A/D
conversion of the conversion count specification can be confirmed by conversion count completion flag bit
(ADEOCF.EOCF).
Then, when the A/D conversion of the conversion count specification of the final activation channel is
completed, the scan conversion completion interrupt factor flag (ADSCANS.SCINT) is set in "1" and the
scan conversion is automatically executed repeatedly from the top.
Moreover, when the scan conversion is executed repeatedly from the top, the conversion count completion
flag bit (ADEOCF.EOCF) of each activation channel is automatically cleared to "0".
The conversion count specification (ADNCS.CCNT1,CCNT0) can select 1 to 4 times of each activation
channel.
The data protection function can select invalidity and effective of each activation channel. Moreover, when
the data protection function is effective (ADTCS.PRT="1"), the state of the data protection of each
activation channel can be confirmed by data protection state flag bit (ADPRTF.PRTF).
continuous scan conversion mode is set (ADSCANS.SCMD="0"), the repeat conversion selection bit is set
to repeat mode (ADTCS.RPT="1"), the conversion count specification scan conversion execution enable
(ADNCS.CNTEN="1") is set, the conversion count specification (ADNCS.CCNT1,CCNT0="count") is set,
and the A/D activation is set to the same activation factor at the same time on each activation channel of the
scan conversion target.
The continuous scan conversion when conversion count of each channel is specified advances to the A/D
conversion of the next activation channel when the A/D conversion of conversion count specification
(ADNCS.CCNT1,CCNT0) is executed from activation channel (activation channel of the scan conversion
target) small number, and conversion is completed. Moreover, the activation channel that completes the A/D
conversion of the conversion count specification can be confirmed by conversion count completion flag bit
(ADEOCF.EOCF).
Then, when the A/D conversion of the conversion count specification of the final activation channel is
completed, the scan conversion completion interrupt factor flag (ADSCANS.SCINT) is set in "1" and the
scan conversion is automatically executed repeatedly from the top.
Moreover, when the scan conversion is executed repeatedly from the top, the conversion count completion
flag bit (ADEOCF.EOCF) of each activation channel is automatically cleared to "0".
The conversion count specification (ADNCS.CCNT1,CCNT0) can select 1 to 4 times of each activation
channel.
The data protection function can select invalidity and effective of each activation channel. Moreover, when
the data protection function is effective (ADTCS.PRT="1"), the state of the data protection of each
activation channel can be confirmed by data protection state flag bit (ADPRTF.PRTF).
MB91520 Series
MN705-00010-1v0-E
1893