Fujitsu FR81S User Manual
CHAPTER 44: 12-BIT A/D CONVERTER
2. Features
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 12-BIT A/D CONVERTER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
6
A/D conversion data
When A/D conversion completions, conversion-result data is stored in the A/D data register. One A/D
data register is assigned to each activation channel.
Each A/D data register contains error flag and error status bits, whose values indicate the status of the
A/D conversion data.
Conversion count specification scan conversion
The scan conversion that specifies the A/D conversion count of each activation channel can be executed.
The scan conversion that specifies the A/D conversion count can set 1 type of each 12-bit A/D converter
unit.
The conversion count specification can select 1 to 4 times.
The scan conversion that specifies the A/D conversion count can select the continuous scan conversion
mode and the stop scan conversion mode.
As for the continuous scan conversion mode, the specified activation channel is activated one by one.
When the conversion of the final channel of the scan conversion is completed, the scan conversion is
executed repeatedly from the top.
As for the stop scan conversion mode, the specified activation channel is activated one by one. When the
conversion of the final activation channel of the scan conversion is completed, the conversion stops.
When the next activation factor is input, the scan conversion is executed from the top. However, the
activation factor input converting the scan is disregarded.
Range compare function
Range compare in each activation channel.
Settings of the upper and lower bound threshold can set MAX 4 types. Each activation channel selects
one combination from among 4 types of upper and lower bound threshold settings and executes the
range comparison.
The range comparison can select the confirmation of inside or outside the range of the upper and lower
bound threshold.
The range comparison result can remove the noise according to a continuous detecting function. A
continuous detecting function sets the range comparison result and the range comparison flag is set by
the continuous detection.
The continuous detection count can select 1 to 7 times.
The state of the continuous detection count of the range comparison result can be confirmed.
When the confirmation outside the range of the range comparison, the detection of larger than upper
bound threshold or less than lower bound threshold can be confirmed.
Interrupt request
Each activation channel can generate an interrupt request when A/D conversion completions.
Data protection function
Each A/D data register can be configured to set the data protection function. Note that the data protection
function works when the activation factor is not a compare match.
If the data protection function is enabled, activation requests are masked until data is read from the A/D
data register and the interrupt flag is cleared. Data reading and interrupt flag clearing may be in any
sequence. In addition, whether clearing of the interrupt flag is included in the condition can be
configured.
Whether an A/D activation request or a conversion operation is in progress can be reported using register
bits. Moreover, the current A/D conversion request or conversion operation can be forced to termination
by resetting the A/D activation request bit to "0".
MB91520 Series
MN705-00010-1v0-E
1809