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參數(shù)資料
| 型號(hào)： | M30612M4-152FP |
| 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(jī) |
| 文件頁(yè)數(shù)： | 62/197頁(yè) |
| 文件大?。?/td> | 2673K |
| 代理商： | M30612M4-152FP |
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Mitsubishi microcomputers
M16C / 61 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
DMAC
62
Item
Specification
No. of channels
Transfer memory space
2 (cycle steal method)
From any address in the 1M bytes space to a fixed address
From a fixed address to any address in the 1M bytes space
From a fixed address to a fixed address
(Note that DMA-related registers [0020
16
to 003F
16
] cannot be accessed)
128K bytes (with 16-bit transfers) or 64K bytes (with 8-bit transfers)
Falling edge of INT0 or INT1 (INT0 can be selected by DMA0, INT1 by DMA1)
Timer A0 to timer A4 interrupt requests
Timer B0 to timer B2 interrupt requests
UART0 transmission and reception interrupt requests
UART1 transmission and reception interrupt requests (UART1 trans-
mission can be selected by DMA0, UART1 reception by DMA1)
UART2 transmission and reception interrupt requests
A-D conversion interrupt requests
Software triggers
DMA0 takes precedence if DMA0 and DMA1 requests are generated simultaneously
8 bits or 16 bits
forward/fixed (forward direction cannot be specified for both source and
destination simultaneously)
Single transfer mode
After the transfer counter underflows, the DMA enable bit turns to
“0”, and the DMAC turns inactive
Repeat transfer mode
After the transfer counter underflows, the value of the transfer counter
reload register is reloaded to the transfer counter.
The DMAC remains active unless a “0” is written to the DMA enable bit.
DMA interrupt request generation timing
When an underflow occurs in the transfer counter
Active
When the DMA enable bit is set to “1”, the DMAC is active.
When the DMAC is active, data transfer starts every time a DMA
transfer request signal occurs.
Inactive
When the DMA enable bit is set to “0”, the DMAC is inactive.
After the transfer counter underflows in single transfer mode
At the time of starting data transfer immediately after turning the DMAC active,
re
the value of one of source pointer and destination pointer - the one specified for the
forward direction - is reloaded to the forward direction address pointer,and the value
of the transfer counter reload register is reloaded to the transfer counter.
Writing to register
Registers specified for forward direction transfer are always write enabled.
Registers specified for fixed address transfer are write-enabled when
the DMA enable bit is “0”.
Reading the register
Can be read at any time.
However, when the DMA enable bit is “1”, reading the register set up as the
forward register is the same as reading the value of the forward address pointer.
Note: DMA transfer is not effective to any interrupt. DMA transfer is affected neither by the interrupt enable
flag (I flag) nor by the interrupt priority level.
Maximum No. of bytes transferred
DMA request factors (Note)
Channel priority
Transfer unit
Transfer address direction
Transfer mode
Table 1.15.1. DMAC specifications
Forward address pointer and
load timing for transfer
counter
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