7721 Datasheet, PDF (351/577 Pages) List of Unclassifed Manufacturers – H Bridge Power Module

DMA CONTROLLER
13.7 Array chain transfer mode
13.7.2 Setting of array chain transfer mode
Figures 13.7.3 through 13.7.5 show an initial setting example for registers relevant to the array chain
transfer mode.
In addition, when timer A, timer B, UART, or the A-D converter is selected as a DMA request source, the
setting for the peripheral is required. For details of the setting, refer to the chapter of each peripheral
function.
When a DMAi interrupt is used, the setting for enabling the interrupt is also required. For details, refer to
“CHAPTER 7. INTERRUPTS.”
When external DMA source is selected
When internal DMA source is selected
Setting port P9 direction register
b7
b0
Port P9 direction register (Address 1516)
DMAREQ0 pin
DMAREQ1 pin
DMAREQ2 pin
DMAREQ3 pin
Clear the corresponding bit to “0.”
Setting interrupt priority level
b7
b0
DMAi interrupt control register (i = 0 to 3)
(Addresses 6C16 to 6F16)
Interrupt priority level select bits
When using interrupts, set these bits to one of
levels 1 to 7.
When disabling interrupts, set these bits to
level 0.
Continue to “Figure 13.7.4” on next page.
Fig. 13.7.3 Initial setting example for registers relevant to array chain transfer mode (1)
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7721 Group User’s Manual