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REJ09B0138-0600H
16.4.4
External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGS1 and TRGS0 bits are set to 11 in ADCR, external trigger
input is enabled at the
ADTRG
pin. A falling edge at the
ADTRG
pin sets the ADST bit to 1 in ADCSR, starting A/D
conversion. Other operations, in both single and scan modes, are the same as if the ADST bit has been set to 1 by
software. Figure 16-6 shows the timing.
ø
ADTRG
Internal trigger signal
ADST
A/D conversion
Figure 16-6 External Trigger Input Timing
16.5
Interrupts
The A/D converter generates an A/D conversion end interrupt (ADI) at the end of A/D conversion. ADI interrupt requests
can be enabled or disabled by means of the ADIE bit in ADCSR.
The DTC or DMAC can be activated by an ADI interrupt. Having the converted data read by the DTC or DMAC in
response to an ADI interrupt enables continuous conversion to be achieved without imposing a load on software.
The A/D converter interrupt source is shown in table 16-5.
Table 16-5 A/D Converter Interrupt Source
Interrupt Source
Description
DTC or DMAC Activation
ADI
Interrupt due to end of conversion
Possible
Содержание ZTAT H8S/2357F
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