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
95
5.2.14.
High priority activation request operation of
other activation channel during the scan conversion
The high priority activation request operation of other activation channel during the scan
conversion is explained.
conversion is explained.
When the scan conversion is executed between the activation channels corresponding to the same A/D
converter unit, the activation channel gives priority and is controlled by the activation factor and activation
channel information. The priority control is done by the A/D activation arbitration of latter part.
converter unit, the activation channel gives priority and is controlled by the activation factor and activation
channel information. The priority control is done by the A/D activation arbitration of latter part.
When it is generated from the activation channel of a activation channel number that is smaller than the
same activation factor and the activation channel that does the scan conversion, the scan conversion is
stopped temporarily after the operation of the A/D conversion is completed. Then, the scan conversion that
stops temporarily is restarted after completing the A/D conversion of the activation channel from a small
activation channel number.
same activation factor and the activation channel that does the scan conversion, the scan conversion is
stopped temporarily after the operation of the A/D conversion is completed. Then, the scan conversion that
stops temporarily is restarted after completing the A/D conversion of the activation channel from a small
activation channel number.
Figure 5-19 Operation of the same activation factor request from small activation channel
number when continuous scan is converted
number when continuous scan is converted
[Channel composition information]
Start channel N, N+1, and N+2: There are a repetition mode and a security function, and software is started (The N to N+2
channel is converted the scanning). Start channel N-1:Single mode and software start
Start channel N, N+1, and N+2: There are a repetition mode and a security function, and software is started (The N to N+2
channel is converted the scanning). Start channel N-1:Single mode and software start
N channel
N+1 channel
N+2 channel
N-1 channel
stop
A/D conversion
During
conversion(N)
During
conversion(N+1)
During
conversion(N+2)
During
conversion(N)
During
conversion(N-1)
During
conversion(N+2)
stop
Activation trigger
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 conversion of N+1 is not interrupted, and
even the conversion end is executed.
Restart from conversion of N+2
During
conversion(N+1)
The analog to digital conversion of start channel (N-1) of a small
start channel number is executed.
stop
Data register N lead ( & interruption N clearness)
When the activation factor whose priority is higher than the activation channel that does the scan
conversion is generated from other activation channels, the scan conversion is interrupted. Then, the A/D
conversion is restarted from the activation channel of the interrupting scan conversion after the A/D
conversion of the high priority is completed.
conversion is generated from other activation channels, the scan conversion is interrupted. Then, the A/D
conversion is restarted from the activation channel of the interrupting scan conversion after the A/D
conversion of the high priority is completed.
MB91520 Series
MN705-00010-1v0-E
1898