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

Figure 5-16 Continuous scan conversion when conversion count of each channel is specified

(In case of data protection function effective)

stop

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)

During

conversion(N ch)

(The first)

Conversion frequency
completion flag
(ADEOCF.ECOF

)

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

N+1

)

Conversion frequency
completion flag
(ADEOCF.ECOF

N+2

)

Protection state flag
(ADPRT.PRTF

)

Protection state flag
(ADPRT.PRTF

N+1

)

Protection state flag
(ADPRT.PRTF

N+2

)

A/D data register
(ADTCD

.D11～D0)

A/D data register
(ADTCD

N+1

.D11～D0)

A/D data register
(ADTCD

N+2

.D11～D0)

Scanning conversion completion

interruption factor flag

(ADSCANS.SCINT)

At continuous execution of a different start channel

The activate request of the next start channel is output regardless with the state

of the data protection.

When the final start channel processing to be

scanned is completed, it is automatically an iterative

implementation from the beginning as for the

scanning conversion.

stop

sto

stop

← Protection

state release

← Protection

state release

← Protection

state release

← Protection

state release

← Protection

state release

The analog to digital conversion is restarted by the data

protection state release at continuous execution in the same

start channel.

Software factor start (N, N+1 and

N+2 channels simultaneous)

[Channel composition information]

Start channel N, N+1, and N+2: It are the repetition mode and the security function, and is a software start, a continuous

scanning conversion mode, conversion frequency specification scanning conversion execution permission, and is a continuous

conversion frequency: Start channel N+2 = twice start channel N+1 = once start channel N= twice



Stop scan conversion when conversion count of each channel is specified

The stop scan conversion when conversion count of each channel is specified is executed by the stop scan

conversion mode is set (ADSCANS.SCMD="1"), 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 stop 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 becomes the state of the stop. The scan conversion restarts (return from the state of the

stop) when the A/D activation factor is generated even by one of the scan conversion targets.

Moreover, the conversion count completion flag bit (ADEOCF.EOCF) of each activation channel is

automatically cleared to "0" by restarting (return from the state of the stop) the scan conversion.

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).



In case of data protection function invalid (ADTCS.PRT="0")

The scan conversion continuously executes A/D conversions other than the state of the stop without

stopping. The data of the A/D conversion data is not protected, and. the last A/D conversion data

MB91520 Series

MN705-00010-1v0-E

1895