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CHAPTER 12 A/D CONVERTER
12.5 Interrupt of A/D Converter
A factor for an interrupt of the A/D converter is the following.
• Completion of conversion when A/D conversion functions are enabled
■ Interrupt when A/D Conversion Functions are Enabled
When A/D conversion is completed, the interrupt request flag bit (ADC1: ADI) is set to "1". At this time, if
the bit for enabling an interrupt request is enabled (ADC2: ADIE = 1), an interrupt request to the CPU
(IRQ8) occurs. Write "0" to the ADI bit using the routine for interrupt handling to clear the interrupt
request.
The ADI bit is set when A/D conversion is completed, irrespective of the value of the ADIE bit.
Note:
When the ADI bit is "1", if the ADIE bit is enabled (changed from "0" to "1"), an interrupt request
occurs immediately.
■
Register and Vector Table Related to the Interrupt of the A/D Converter
See Section "3.4.2 Steps in the Interrupt Operation " for the interrupt operation.
Table 12.5-1 Register and Vector Table Related to the Interrupt of the A/D Converter
Interrupt name
Register to set the interrupt level Address of the vector table
Register Bit to be set High order Low order
IRQ8
ILR3 (007D
H
)
L81 (bit1) L80 (bit0)
FFEA
H
FFEB
H