參數(shù)資料
型號(hào): M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機(jī)
文件頁數(shù): 81/172頁
文件大?。?/td> 1193K
代理商: M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Direct Memory Access Controller
7/9/98
2-69
2.11 Direct Memory Access Controller
This device contains a two-channel Direct Memory Access Controller (DMAC). Each channel performs
fast data transfers between any two locations in the memory map initiated by specific peripheral
events or software triggers.
The main features of the DMAC are as follows:
Two independent channels
Single-byte and burst transfer modes
16-bit source and destination address registers (for a 64K byte address space)
16-bit transfer count registers (for up to 64K bytes transferred before underflow)
Source/Destination register automatic increment/decrement and no-change options
Source/Destination/Transfer count register reload on write or after transfer count register underflow
options
Transfer requests from USB (9), MBI (4), external interrupts (4), UART1 (2), UART2 (2), SIO
(1), TimerX (1), TimerY (1), Timer1 (1), and software triggers
Closely coupled with USB and MBI for efficient data transfers
Interrupt generated for each channel when their respective transfer count register underflows
Fixed channel priority (channel 0 > channel 1)
Two cycles of
Φ
required per byte transferred
Each channel of the DMAC is made up of the following:
16-bit source and destination registers
A 16-bit transfer count register
Two mode registers
Status flags contained in a status register shared by the two channels
Control and timing logic
Address
Description
Acronym and
Value at Reset
003F
16
0040
16
0041
16
0042
16
0043
16
0044
16
0045
16
0046
16
0047
16
DMAC index and status register
DMAC channel x mode register 1
DMAC channel x mode register 2
DMAC channel x source register Low
DMAC channel x source register High
DMAC channel x destination register Low
DMAC channel x destination register High
DMAC channel x transfer count register Low DMAxCL=00
DMAC channel x transfer count register High DMAxCH=00
DMAIS=00
DMAxM1=00
DMAxM2=00
DMAxSL=00
DMAxSH=00
DMAxDL=00
DMAxDH=00
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