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型號：	MT80C31-25R
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
文件頁數(shù)：	693/1447頁
文件大小：	3788K
代理商：	MT80C31-25R

6437E–ATARM–23-Apr-13

24. Peripheral DMA Controller (PDC)

Description

The Peripheral DMA Controller (PDC) transfers data between on-chip serial peripherals and the

on- and/or off-chip memories. The link between the PDC and a serial peripheral is operated by

the AHB to ABP bridge.

The user interface of each PDC channel is integrated into the user interface of the peripheral it

serves. The user interface of mono directional channels (receive only or transmit only), contains

two 32-bit memory pointers and two 16-bit counters, one set (pointer, counter) for current trans-

fer and one set (pointer, counter) for next transfer. The bi-directional channel user interface

contains four 32-bit memory pointers and four 16-bit counters. Each set (pointer, counter) is

used by current transmit, next transmit, current receive and next receive.

Using the PDC removes processor overhead by reducing its intervention during the transfer.

This significantly reduces the number of clock cycles required for a data transfer, which

improves microcontroller performance.

To launch a transfer, the peripheral triggers its associated PDC channels by using transmit and

receive signals. When the programmed data is transferred, an end of transfer interrupt is gener-

ated by the peripheral itself.

Embedded Characteristics

Acting as one AHB Bus Matrix Master

Allows data transfers from/to peripheral to/from any memory space without any intervention

of the processor.

Next Pointer support, prevents strong real-time constraints on buffer management.

The Peripheral DMA Controller handles transfer requests from the channel according to the fol-

lowing priorities (Low to High priorities):

Table 24-1.

Peripheral DMA Controller

Instance name

Channel T/R

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
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MT80C51FB	制造商:Rochester Electronics LLC 功能描述:- Bulk
MT80C51FB/B	制造商:Intel 功能描述:
MT80GB	制造商:Datak Corporation 功能描述:

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