STR720 datasheet(89/401 Pages) STMICROELECTRONICS

部件名	STR720

功能描述	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

89 / 401 page

STR720 - DMA CONTROLLER (DMAC)

89/401

Bit 8:7 = DeSize: DMA to destination data width

These bits are used to select the data width for DMA to destination data transfer.

00: 1 byte

01: 1 half-word

10: 1 word

11: reserved

Bit 9 = Circular: Circular mode

This bit is used to enable DMA to operates in the circular buffer mode.

0: normal buffer mode

1: circular buffer mode

Bit 12:10 = Reserved. They must be always written to ‘0’.

Bit 13 = Dir: Direction transfer

This bit defines which field between DeSize and SoSize is used to compute burst and terminal

count word unit; since the side of DMA transfer requiring a burst is usually the peripheral one

this bit can be considered indicating the direction of the transfer, specifying if the peripheral is

acting as source or destination.

0: SoSize defines the word unit for burst and terminal count (peripheral is the source).

1: DeSize defines the word unit for burst and terminal count (peripheral is the destination).

Bit 15:14 = Reserved. They must be always written to ‘0’.

STR720 数据表(PDF) 89 Page - STMicroelectronics