M306V2ME Datasheet, PDF (76/276 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
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
Table 2.9.2 No. of DMAC transfer cycles
Transfer unit
8-bit transfers
(DMBIT= “1”)
16-bit transfers
(DMBIT= “0”)
Bus width
16-bit
(BYTE= “L”)
8-bit
(BYTE = “H”)
16-bit
(BYTE = “L”)
8-bit
(BYTE = “H”)
Single-chip mode Memory expansion mode
Access address
Microprocessor mode
No. of read No. of write No. of read No. of write
cycles
cycles
cycles
cycles
Even
1
1
1
1
Odd
1
1
1
1
Even
—
—
1
1
Odd
—
—
1
1
Even
1
1
1
1
Odd
2
2
2
2
Even
—
—
2
2
Odd
—
—
2
2
Coefficient j, k
Internal memory
Internal ROM/RAM Internal ROM/RAM SFR area
/OSD RAM
No wait
With wait
1
2
2
External memory
Separate bus Separate bus
No wait
1
With wait
2
Multiplex
bus
3
Rev. 1.0
76