SH7041A datasheet(301/923 Pages) RENESAS

Part #	SH7041A

Description	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

PDF	923 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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11.3.11

Source Address Reload Function

Channel 2 has a source address reload function. This returns to the first value set in the source

address register (SAR2) every four transfers by setting the RO bit of CHCR2 to 1. Figure 11.25

illustrates this operation. Figure 11.26 is a timing chart for reload ON mode, with burst mode,

autorequest, 16-bit transfer data size, SAR2 increment, and DAR2 fixed mode.

SAR2

(initial value)

DMAC

Transfer

request

DMAC control block

Reload control

4th count

CHCR2

DMATCR2

SAR2

RO bit = 1

Count signal

Reload

signal

Reload signal

Figure 11.25 Source Address Reload Function

Internal

address bus

Internal

data bus

SAR2

DAR2

SAR2+2

SAR2+4

SAR2+6

SAR2

DAR2

SAR2 data

SAR2+2 data

SAR2+4 data

SAR2+6 data

SAR2 data

1st channel 2

transfer

2nd channel 2

transfer

3rd channel 2

transfer

4th channel 2

transfer

5th channel 2

transfer

SAR2 output

DAR2 output

SAR2+2 output

DAR2 output

SAR2+4 output

DAR2 output

SAR2+6 output

DAR2 output

SAR2 output

DAR2 output

After SAR2+6 output, SAR2 is reloaded

Bus right is returned one time in four

Figure 11.26 Source Address Reload Function Timing Chart

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