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型號(hào)：	M32185F4VFP
元件分類(lèi)：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 80 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
文件頁(yè)數(shù)：	228/1032頁(yè)
文件大?。?/td>	5750K
代理商：	M32185F4VFP

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

9.2 DMAC Related Registers

[DMnCNT1 Register]

(1) SADBNx (DMAn Source Address Bank Select) bits (Bits 8, 9)

These bits select a source address bank to be used from among Bank 0, Bank 1. But Bank1 does not exist

in the 32185, setting Bank1 is prohibited. Also, no transfer over the bank is carried out. Upon completion

of bank transfer to the final address, the bank is then to be transferred to the head address.

(2) DADBNx (DMAn Destination Address Bank Select) bits (Bits 10, 11)

These bits select a destination address bank to be used from among Bank 0, Bank 1. But Bank1 does not

exist in the 32185, setting Bank1 is prohibited. Also, no transfer over the bank is carried out. Upon

completion of bank transfer to the final address, the bank is then to be transferred to the head address.

(3) REQESELn (Extended DMAn Transfer Request Source Select) bits (Bits 12–15)

These bits select the cause or source of extended DMA transfer request on each DMA channel.

Note: The extended DMA transfer request sources selected by the REQESELn (Extended DMAn

Transfer Request Source Select) bits have no effect unless the “Extended” DMA transfer

request source is selected with the DMA Channel Control Register’s DMA Request Source

Select (REQSLn) bits.

[DMnCNT2 Register]

(1) SELFEN (DMAn Self Channel Transfer Select ) bit (Bit 8)

Clearing this bit to “0” disables self channel transfer, and setting it to “1” enables self channel

transfer. In case where self channel transfer was allowed, the DMA transfer request occurs for the

self channel each time single DMA transfer is completed if the initial transfer request arises, and

DMA transfer is carried out until all transfers are completed (transfer count register underflow).

However the control of internal bus is relinquished each time single DMA transfer is completed.

And if set DMA transfer n times, DMA transfer request is occured for its channel after completing all

DMA transfer, so that it is necessary to pay attention of clearing DMA transfer request or so on

when DMA transger is started again.

(2) RINGSEL (DMAn Rign Buffer Select) bit (Bits 10–15)

These bits select the number of DMA transfers to each channel in the ring buffer mode from among

32, 16, 8, 4 and 2 times.

In the ring buffer mode, after transfer from the transfer start address, the bit returns to the transfer

start address again, and the same operation is repeated by the number of transfers thus selected. In

the ring buffer mode, the transfer count register is placed in the free run mode, and transfer operation

is continued until the transfer enable bit is cleared to “0” (transfer disable).

Also, during the ring buffer mode the DMA transfer completed interrupt request does not occur.

Notes: When the self channel transfer was allowed during ring buffer mode setting, care must be

exercised to its endless transfer.

The transfer start address must be as follows:

Transfer Size: 8 bits

Transfer Size: 16 bits

32-time ring buffer mode Low order 5 bits – B’00000

Low order 6 bits – B’000000

16-time ring buffer mode Low order 4 bits – B’0000

Low order 5 bits – B’00000

8-time ring buffer mode Low order 3 bits – B’000

Low order 4 bits – B’0000

4-time ring buffer mode Low order 2 bits – B’00

Low order 3 bits – B’000

2-time ring buffer mode Low order 1 bits – B’0

Low order 3 bits – B’00

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