MB88111 Datasheet, PDF (11/26 Pages) Fujitsu Component Limited. – A/D Converter (With 24-Channel Input at 10-bit Resolution)

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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