CHAPTER 11 A/D CONVERTER
User’s Manual U12688EJ4V0UM00
342
(2) 4-buffer mode (External trigger select: 4-buffer)
One analog input is A/D converted four times using the ADTRG signal as a trigger and the results are stored in
the ADCR0 to ADCR3 registers. The INTAD interrupt is generated and conversion ends when the four A/D
conversions end.
Trigger
Analog Input
A/D Conversion Result Register
ADTRG signal
ANIn
ADCR0
ADTRG signal
ANIn
ADCR1
ADTRG signal
ANIn
ADCR2
ADTRG signal
ANIn
ADCR3
(n = 0 to 3)
While the CE bit of the ADM0 register is 1, A/D conversion is repeated every time a trigger is input from the
ADTRG pin.
This is most appropriate for applications that determine the average A/D conversion results.
Figure 11-16. Example of 4-Buffer Mode (External Trigger Select 4-Buffer) Operation
ANI0
ANI1
ANI2
ANI3
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
ADCR6
ADCR7
A/D converter
ADTRG
(
×
4)
(
×
4)
(1)
CE bit of ADM0 is set to 1 (enable)
(8)
External trigger generation
(2)
External trigger generation
(9)
ANI2 A/D conversion
(3)
ANI2 A/D conversion
(10) Conversion result is stored in ADCR2
(4)
Conversion result is stored in ADCR0
(11) External trigger generation
(5)
External trigger generation
(12) ANI2 A/D conversion
(6)
ANI2 A/D conversion
(13) Conversion result is stored in ADCR3
(7)
Conversion result is stored in ADCR1
(14) INTAD interrupt generation
Содержание V850E/MS1 UPD703100
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