M32C83T datasheet(152/527 Pages) RENESAS

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Page 129

13. DMACII

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13.1.3 Interrupt Control Register for the Peripheral Function

For the peripheral function interrupt activating a DMAC II request, set the ILVL2 to ILVL0 bits to "1112"

(level 7).

13.1.4 Relocatable Vector Table for the Peripheral Function

Set the starting address of the DMAC II index in the interrupt vector for the peripheral function interrupt

activating a DMAC II request.

When using the chained transfer, the relocatable vector table must be located in the RAM.

13.1.5 IRLT Bit in the IIOiIE Register (i=0 to 11)

When the intelligent I/O interrupt or CAN interrupt is used to activate DMAC II, set the IRLT bit in the IIOiIE

13.2 DMAC II Performance

The DMAC II function is selected by setting the DMA II bit to "1" (DMAC II transfer). DMAC II request is

activated by all peripheral function interrupts with the ILVL2 to ILVL0 bits set to "1112" (level 7). These

peripheral function interrupt request signals become DMAC II transfer request signals and the peripheral

function interrupt cannot be used.

When an interrupt request is generated by setting the ILVL2 to ILVL0 bits to "1112" (level 7), the DMAC II is

activated regardless of what state the I flag and IPL is in.

13.3 Transfer Data

The DMAC II transfers 8-bit or 16-bit data.

• Memory-to-memory transfer : Data is transferred from a desired memory location in a 64-Kbyte space

(Addresses 0000016 to 0FFFF16) to another desired memory location in the same space.

• Immediate data transfer : Immediate data is transferred to a desired memory location in a 64-Kbyte space.

• Calculation transfer : Two 8-bit or16-bit data are added together and the result is transferred to a desired

memory location in a 64K-byte space.

When a 16-bit data is transferred to the destination address 0FFFF16, it is transferred to 0FFFF16 and

1000016. The same transfer occurs when the source address is 0FFFF16 .

13.3.1 Memory-to-Memory Transfer

Data transfer between any two memory locations can be:

• a transfer from a fixed address to another fixed address

• a transfer from a fixed address to a relocatable address

• a transfer from a relocatable address to a fixed address

• a transfer from a relocatable address to another relocatable address

When a relocatable address is selected, the DMAC II increments address, after a transfer, for the next

transfer. In a 8-bit transfer, the transfer address is incremented by one. In a 16-bit transfer, the transfer

address is incremented by two.

When a source or destination address exceeds address 0FFFF16 as a result of address incrementation,

the source or destination address returns to address 00000016 and continues incrementation. Maintain

source and destination address at address 0FFFF16 or below.

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