參數(shù)資料
型號: M30240F8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機
文件頁數(shù): 67/142頁
文件大?。?/td> 1637K
代理商: M30240F8
1-67
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
DMAC
Figure 1.57: Example of the transfer cycle for a source read
CLKout
Address
bus
Data
bus
CPU use
CPU use
CPU use
CPU use
Source
Source
Destination
Destination
Dummy
cycle
Dummy
cycle
(1) 8-bit transfers
16-bit transfers from even address and the source address is even.
CLKout
Address
bus
RD signal
WR signal
Data
bus
CPU use
CPU use
CPU use
CPU use
Source
Source
Destination
Destination
Dummy
cycle
Dummy
cycle
(3) One wait is inserted into the source read under the conditions in (1)
CLKout
Address
bus
Data
bus
CPU use
CPU use
CPU use
CPU use
Source
Source
Destination
Destination
Dummy
cycle
Dummy
cycle
Source + 1
Source + 1
(2) 16-bit transfers and the source address is odd
Transferring 16-bit data on an 8-bit data bus (In this case, there are two destination write cycles).
CLKout
Address
bus
RD signal
WR signal
Data
bus
CPU use
CPU use
CPU use
CPU use
Source
Source
Destination
Destination
Dummy
cycle
Dummy
cycle
Source + 1
Source + 1
(4) One wait is inserted into the source read under the conditions in (2)
(When 16-bit data is transferred on an 8-bit data bus, there are two destination write cycles).
Note: The same timing changes occur with the respective conditions at the destination as at the source.
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