參數(shù)資料
型號： M37920FCCHP
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)： 71/158頁
文件大?。?/td> 1261K
代理商： M37920FCCHP
71
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
tween an external I/O and the external memory, this method allows
the memory to be read at the same time the data is written to the
external I/O, and vice versa, resulting in fast data transfer. Bit 0 of the
DMA
i
mode register H determines whether the 1-bus cycle transfer
is to be made from the external memory to the external I/O or from
the external I/O to the external memory. When the bit is
“
1
”
, the data
transfer is made from the external I/O to the external memory.
Figure 71 shows an connection example with external memories and
external I/Os in 1-bus cycle transfer (the external data bus width = 16
bits and
“
1 transfer unit
”
= 16 bits).
For the transfer from the external memory to external I/O, the exter-
nal-memory-side address (transfer source address) is output to the
address bus, pin RD goes to
“
L
”
, and the read operation will be per-
formed.
This ensures that the data is read out from the external memory. At
the same time, pin DMAACK
i
corresponding to the operating DMAi
channel (i = 0 to 2) goes to
“
L
”
, the external I/O is selected, and the
data read from the external memory is directly fetched at the rising of
signal RD. In this manner, data is transferred from external memory
to external I/O in 1 bus cycle.
For the transfer from the external I/O to the external memory, the
data is read out from the external I/O, selected by the acknowledge
signal from pin DMAACK
i
, to the data bus. At the same time, the ex-
ternal-memory-side address (transfer destination address) is output
to the address bus, pin BLW (write signal for even-numbered ad-
dresses) and pin BHW (write signal for odd-numbered addresses)
go to
“
L
”
, and the write operation to the external memory is per-
formed.
The 1-bus cycle transfer cannot perform operations for a read from
or a write to the internal memory. In order to perform the transfer from
the internal memory to the external I/O or from the external I/O to the
internal memory, be sure to select the 2-bus cycle transfer method.
Data transfer method
Two different data transfer methods are available: 2-bus cycle trans-
fer, effective for memory-to-memory data transfer, and 1-bus cycle
transfer, effective for memory-to-I/O or I/O-to-memory data transfer.
Both methods are described in detail below.
(1) 2-bus cycle transfer
When bit 1 of the DMA
i
mode register L, as shown in Figure 69, is
cleared to
“
0
”
, the 2-bus cycle transfer method is selected. This
method makes data to be transferred by the
“
1 transfer unit
”
, by us-
ing 1 read bus cycle and 1 write bus cycle. The
“
1 transfer unit
”
re-
fers to the number of bits which can be transferred in 1 DMA transfer
operation, and it is determined by bit 0 of the DMA
i
mode register L.
When bit 0 is cleared to
“
0
”
,
“
1 transfer unit
”
consists of 16 bits (2
bytes); when
“
1
”
,
“
1 transfer unit
”
consists of 8 bits (1 byte).
In the 2-bus cycle transfer, be sure to clear bit 0 of the DMA
i
mode
register H to
“
0
”
.
Figure 70 shows an connection example with external memories in
2-bus cycle transfer. In the read cycle, the transfer source address is
output to the address bus, and the data at this address is read out by
the
“
1 transfer unit
”
and then stored into the BIU
’
s data buffer. When
16-bit data is read out from an odd-numbered address or when 16-
bit data is read out with the external data bus width = 8 bits, the mi-
crocomputer will enter the write cycle after the above 16-bit data is
stored into the BIU
’
s data buffer in 2 accesses.
In the write cycle, the transfer destination address is output to the
address bus, and the data which has been stored in the BIU
’
s data
buffer is written to the transfer destination address. When 16-bit data
is read out from an odd-numbered address or when 16-bit data is
read out with the external data bus width = 8 bits, the microcomputer
will preforms the write operation in 2 accesses.
(2) 1-bus cycle transfer
When bit 1 of the DMA
i
mode register L is set to
“
1
”
, the 1-bus cycle
transfer method is selected. When data transfer is to be made be-
Fig. 65 Block diagram of DMA controller
Internal address bus
: Internal bus
: DMA controller
’
s bus
Internal address bus
Decrementer
Incrementer/Decrementer
Source address register 0 (SAR0)
Destination address register 0 (DAR0)
Source address register
1 (SAR1)
Destination address register 1 (DAR1)
Source address register
2 (SAR2)
Destination address register 2 (DAR2)
Destination address register 3 (DAR3)
Source address register
3 (SAR3)
Transfer counter register 0 (TCR0)
Transfer counter register 1 (TCR1)
Transfer counter register 2 (TCR2)
Transfer counter register 3 (TCR3)
Bus
Interface
Unit
(BIU)
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
M37P75C4P3 功能描述:汽車連接器 Pin Contact RoHS:否 制造商:Amphenol SINE Systems 產(chǎn)品:Contacts 系列:ATP 位置數(shù)量: 型式:Female 安裝風(fēng)格: 端接類型: 觸點電鍍:Nickel
M37S07K4F3 功能描述:汽車連接器 Sckt Contact RoHS:否 制造商:Amphenol SINE Systems 產(chǎn)品:Contacts 系列:ATP 位置數(shù)量: 型式:Female 安裝風(fēng)格: 端接類型: 觸點電鍍:Nickel
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