MB88111 查看數據表（PDF） - Fujitsu

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MB88111

A/D Converter (With 24-Channel Input at 10-bit Resolution)

Fujitsu 

MB88111

4. ATC (Auto Trigger Conversion) Command

The ATC command is the same as the STC command in basic operation. This command can initiates A/D

conversion using the external trigger pin ATGX. The external trigger signal is sampled by 1 µs clock and filtered

by 1 clock. The external trigger signal input during A/D conversion is ignored. If the next command is the STOP

command, A/D conversion is terminated. If it is the NOP command, the ATC command is executed continuously.

The channel cannot be changed at this time. To change the channel, input the ATC command to that effect.

• Example of ATC command execution (1)

NOP command input during A/D conversion enables the same channel to be A/D converted.

An attempt to set the ATGX signal low during A/D conversion is ignored.

NOP command input during A/D conversion does not affect operation. Output data at this time is 0000H.

16 Cycle

SCK

SIN

AN5

NOP

AN6

NOP

STOP

SOT

0000H

Data 5

Data 5

0000H

Data 6

ENDC

IRQX

ATGX

A/D

AN5 conversion

AN5 conversion

AN6 conversion

• Example of ATC command execution (2)

Setting the ATGX signal low again after A/D conversion restarts A/D conversion.

In data output mode B, however, do not use the ATC command in this way, or data will not be output correctly.

If A/D conversion is completed during NOP command input, the ENDC and IRQX pin levels become “H” and

“L” respectively upon completion of the NOP command input.

16 Cycle

SCK

SIN

AN7

AN8

NOP

STOP

SOT

0000H

Data 7

0000H

Data 8

ENDC

IRQX

ATGX

A/D

AN7 conversion

AN7 conversion

AN7

conversion

AN8 conversion

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