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
89
5.2.13.
Scan conversion mode
The scan conversion mode is explained.
The scan conversion is operation that does the A/D conversion from the activation channel number with a
small activation channel one by one. The scan conversion can set 1 type of each 12-bit A/D converter unit.
The scan conversion can be operated as follows.
small activation channel one by one. The scan conversion can set 1 type of each 12-bit A/D converter unit.
The scan conversion can be operated as follows.
Single scan conversion
Continuous scan conversion
Continuous scan conversion when conversion count of each channel is specified
Stop scan conversion when conversion count of each channel is specified
Single scan conversion
The single scan conversion is executed by the repeat conversion select bit is set to single mode
(ADTCS.RPT="0"), 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 scan conversion converts A/D from a small activation channel number (activation channel from which
A/D is activated) one by one by the A/D activation arbitration of latter part. When the A/D conversion of
the final activation channel is completed, the scan conversion is stopped.
(ADTCS.RPT="0"), 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 scan conversion converts A/D from a small activation channel number (activation channel from which
A/D is activated) one by one by the A/D activation arbitration of latter part. When the A/D conversion of
the final activation channel is completed, the scan conversion is stopped.
Figure 5-13 Single scan conversion
Softwear activation
request(N+1 channel)
request(N+1 channel)
A/D conversion
stop
Activation trigger
Softwear activation
request(N channel)
request(N channel)
During conversion(N channel)
During conversion(N+1 channel)
During conversion(N+2 channel)
stop
Softwear activation
request(N+2 channel)
request(N+2 channel)
Softwear factor
activation(N,N+1,N+2channel)
activation(N,N+1,N+2channel)
Continuous scan conversion
The continuous scan conversion is executed by the repeat conversion select bit is set to repeat mode
(ADTCS.RPT="1"), the data protection function is set to effective (ADTCS.PRT="1"), 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.
When two or more repeat modes (ADTCS.RPT="1") are set between the activation channels corresponding
to the same A/D converter, only certain one channel (channel with the highest priority level) will be
processed in the A/D activation arbitration of latter part.
In this case, please make the protection function effective about those activation channels.
(ADTCS.RPT="1"), the data protection function is set to effective (ADTCS.PRT="1"), 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.
When two or more repeat modes (ADTCS.RPT="1") are set between the activation channels corresponding
to the same A/D converter, only certain one channel (channel with the highest priority level) will be
processed in the A/D activation arbitration of latter part.
In this case, please make the protection function effective about those activation channels.
In case of data protection function invalid (ADTCS.PRT="0")
In the A/D activation arbitration, the activation channel number that the priority of the activation factor
is high and the activation channel is small is given to priority. When the repeat mode is set
(ADTCS.RPT="1"), the activation request is continuously output. Therefore, the conversion of the
activation channel with low priority is not executed.
In the A/D activation arbitration, the activation channel number that the priority of the activation factor
is high and the activation channel is small is given to priority. When the repeat mode is set
(ADTCS.RPT="1"), the activation request is continuously output. Therefore, the conversion of the
activation channel with low priority is not executed.
In case of data protection function effective (ADTCS.PRT="1")
In the A/D activation arbitration, the activation channel number that the priority of the activation factor
is high and the activation channel is small is given to priority. When the repeat mode is set
(ADTCS.RPT="1"), the activation request is continuously output. However, it enters the state of the data
protection if the A/D conversion result is stored in A/D data register (ADTCD), and the mask does the
activation request. As a result, the conversion of the next activation channel can be executed.
In the A/D activation arbitration, the activation channel number that the priority of the activation factor
is high and the activation channel is small is given to priority. When the repeat mode is set
(ADTCS.RPT="1"), the activation request is continuously output. However, it enters the state of the data
protection if the A/D conversion result is stored in A/D data register (ADTCD), and the mask does the
activation request. As a result, the conversion of the next activation channel can be executed.
MB91520 Series
MN705-00010-1v0-E
1892