PIC32MX250F128B-I/SP【PDF 15/320 页】IC MCU 32BIT 128KB FLASH 28-SDIP

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Sheet目录3841

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2011-2012 Microchip Technology Inc.

Preliminary

DS61168D-page 111

PIC32MX1XX/2XX

REGISTER 9-7:

DCHxCON: DMA CHANNEL x CONTROL REGISTER

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0

—

23:16

U-0

—

15:8

R/W-0

U-0

R/W-0

CHBUSY

—

CHCHNS(1)

7:0

R/W-0

U-0

R-0

R/W-0

CHEN(2)

CHAED

CHCHN

CHAEN

—

CHEDET

CHPRI<1:0>

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 31-16 Unimplemented: Read as ‘0’

bit 15

CHBUSY: Channel Busy bit

1 = Channel is active or has been enabled

0 = Channel is inactive or has been disabled

bit 14-9

Unimplemented: Read as ‘0’

bit 8

CHCHNS: Chain Channel Selection bit(1)

1 = Chain to channel lower in natural priority (CH1 will be enabled by CH2 transfer complete)

0 = Chain to channel higher in natural priority (CH1 will be enabled by CH0 transfer complete)

bit 7

CHEN: Channel Enable bit(2)

1 = Channel is enabled

0 = Channel is disabled

bit 6

CHAED: Channel Allow Events If Disabled bit

1 = Channel start/abort events will be registered, even if the channel is disabled

0 = Channel start/abort events will be ignored if the channel is disabled

bit

CHCHN: Channel Chain Enable bit

1 = Allow channel to be chained

0 = Do not allow channel to be chained

bit 4

CHAEN: Channel Automatic Enable bit

1 = Channel is continuously enabled, and not automatically disabled after a block transfer is complete

0 = Channel is disabled on block transfer complete

bit 3

Unimplemented: Read as ‘0’

bit 2

CHEDET: Channel Event Detected bit

1 = An event has been detected

0 = No events have been detected

bit 1-0

CHPRI<1:0>: Channel Priority bits

11 = Channel has priority 3 (highest)

10 = Channel has priority 2

01 = Channel has priority 1

00 = Channel has priority 0

Note 1: The chain selection bit takes effect when chaining is enabled (i.e., CHCHN = 1).

2: When the channel is suspended by clearing this bit, the user application should poll the CHBUSY bit (if

available on the device variant) to see when the channel is suspended, as it may take some clock cycles

to complete a current transaction before the channel is suspended.

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