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11
11.1.4 A-D Converter Interrupt and DMA Transfer Requests
The A-D Converter can generate an A-D conversion interrupt or DMA transfer request each time A-D conver-
sion, comparate operation, single-shot scan or one cycle of continuous scan mode is completed. The A-D Single
Mode Register 0 and A-D Scan Mode Register 0 are used to select between A-D conversion interrupt and DMA
transfer requests.
Scan mode (when one cycle
of scan is completed)
Single mode (when A-D conversion or
comparate operation is completed)
Figure 11.1.10 Selecting between Interrupt and DMA Transfer Requests
11.1.5 Sample-and-Hold Function
The analog input voltage that was sampled immediately after A-D conversion started is held on, and A-D conver-
sion is performed on that seized voltage.
The A-D conversion time in "normal" sample-and-hold mode is the same as in conventional A-D conversion
mode of the 32170, etc. The A-D conversion time in "fast" sample-and-hold mode is significantly short, allowing
to obtain conversion results more quickly than ever.
A-Di Scan Mode Register 0
interrupt/DMA transfer request select bit
A-Di Single Mode Register 0
interrupt/DMA transfer request select bit
11-12
A-D Converters
11.1 Outline of A-D Converters
A-Di conversion interrupt request
(To the Interrupt Controller)
DMA transfer request
(To the DMAC Controller)
i=0, 1
32180 Group User's Manual (Rev.1.0)
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