6V7 datasheet(77/298 Pages) RENESAS

Part #	6V7

Description	SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

PDF	298 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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77 / 298 page

Rev.1.00

May 18, 2004

page 77 of 296

M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP

Single-chip mode

Memory expansion mode

Transfer unit

Bus width

Access address

Microprocessor mode

No. of read

No. of write

No. of read No. of write

cycles

16-bit

Even

8-bit transfers

(BYTE= “L”)

Odd

(DMBIT= “1”)

8-bit

Even

—

(BYTE = “H”)

Odd

—

16-bit

Even

16-bit transfers

(BYTE = “L”)

Odd

(DMBIT= “0”)

8-bit

Even

—

(BYTE = “H”)

Odd

—

Table 2.9.2 No. of DMAC transfer cycles

2.9.2 DMAC Transfer Cycles

Any combination of even or odd transfer read and write addresses is possible. Table 2.9.2 shows the

number of DMAC transfer cycles.

The number of DMAC transfer cycles can be calculated as follows:

No. of transfer cycles per transfer unit = No. of read cycles ✕ j + No. of write cycles ✕ k

Internal memory

External memory

Internal ROM/RAM

SFR area

Separate bus Separate bus

/OSD RAM

No wait

With wait

Coefficient j, k

6V7 Datasheet(PDF) 77 Page - Renesas Technology Corp

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