參數(shù)資料
型號(hào)： M37920FCCGP
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī))
中文描述： 單片微機(jī)16位的CMOS（16位單片機(jī)）
文件頁數(shù)： 82/158頁
文件大?。?/td> 1261K
代理商： M37920FCCGP
M37920FCCGP, M37920FCCHP
M37920FGCGP, M37920FGCHP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
82
Transfer address direction
The address direction in DMA transfers can be designated indepen-
dently for the transfer source and destination. These directions are
available:
“
forward
”
,
“
backward
”
, and
“
fixed
”
. When the forward di-
rection is selected, the address increments. When the backward di-
rection is selected, the address decrements. When the fixed
direction is selected, the address is fixed (2 bytes when 1 transfer
unit consists of 16 bits, or 1 byte when 1 transfer unit consists of 8
bits) and does not change. Use bits 4 and 5 of the DMAi mode regis-
ter L shown in Figure 69 to specify the transfer address direction for
the transfer source. For the transfer destination, use bits 6 and 7.
Figure 77 shows an example of transfer address direction in the 2-
bus cycle transfer (1 transfer unit = 16 bits). Figure 77-(1) shows an
example when the transfer source address direction is
“
forward
”
and
the destination addresses are
“
fixed
”
. In this setup, the transfer
source memory
’
s data is called up in the forward address direction
and written to the transfer destination memory
’
s fixed address by the
“
1 transfer unit
”
. Figure 77-(2) shows an example when both the
transfer source and destination address directions are set to
“
for-
ward
”
by using the DMAi mode register L. In this type of setup, data
are transferred from the transfer source memory to the transfer des-
tination memory in the sequence of
,
,
, .... Figure 77-(3) shows
an example when the transfer source address direction is
“
forward
”
and the destination address direction is
“
backward
”
. Figure 77-(4)
shows an example when the transfer source address direction is
“
backward
”
and the destination address is
“
fixed
”
. In this setup, the
transfer source memory
’
s data is written to the fixed transfer desti-
nation memory
’
s address by the
“
1 transfer unit
”
in the sequence of
,
, and
....
As explained above, in 2-bus cycle transfer, three different address
directions are selectable for each of the transfer source and destina-
tion. A total of nine different address direction combinations are avail-
able.
In 1-bus cycle transfer, the memory side
’
s address direction depends
on the memory bits. For data transfer from memory to external I/O,
therefore, use bits 4 and 5 (transfer-source-address-direction select
bits) of the DMAi mode register L to determine the memory side
’
s
(transfer source) address direction. This is not affected by bits 6 and
7 (transfer-destination-address-direction select bits). For data trans-
fer from external I/O to memory, use bits 6 and 7 of the DMAi mode
register L to determine the memory side
’
s (transfer destination) ad-
dress direction. This is not affected by bits 4 and 5.
相關(guān)PDF資料
PDF描述
M37920FCCHP Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī))
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M3820 Single Chip 8 Bits Microcomputer(8位單片機(jī))
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37920FCCHP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
M37920FGCGP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
M37920FGCHP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
M37920S4CGP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
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