OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 336

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
21.6.16 Channel priority clear register
21.6.17 Bus error clear register
Table 335. Channel priority set register (CHNL_PRIORITY_SET, address 0x4004 C038) bit
This register is a write-only register and configures a DMA channel c (c = 0 to 20) to use
the default priority level. Writing to a bit where a DMA channel is not implemented has no
effect.
Table 336. Channel priority clear register (CHNL_PRIORITY_CLR, address 0x4004 C03C) bit
This register is a read/write register and returns the status of dma_err or sets the dma_err
signal LOW.
Remark: If dma_err is deasserted at the same time as an error occurs on the AHB-Lite
bus, then the error condition takes precedence and dma_err remains asserted.
Bit
20:0
31:21 -
Bit
20:0
31:21 -
Symbol
CHNL_PRIORITY
_CLR
Symbol
CHNL_PRIORITY
_SET
description
description
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 10 March 2011
Chapter 21: LPC122x General purpose micro DMA controller
Description
Returns the channel priority mask status, or sets the channel
priority to high.
Read as:
Bit [c] = 0: DMA channel c is using the default priority level.
Bit [c] = 1: DMA channel c is using a high priority level.
Write as:
Bit [c] = 0: No effect. Use the CHNL_PRIORITY_CLR
Register to set channel c to the default priority level.
Bit [c] = 1: Channel c uses the high priority level.
Reserved.
Description
Set the appropriate bit to select the default priority level for
the specified DMA channel.
Write as:
Bit [c] = 0: No effect. Use the CHNL_PRIORITY_SET
Register to set channel c to the high priority level.
Bit [c] = 1: Channel c uses the default priority level.
Reserved.
UM10441
© NXP B.V. 2011. All rights reserved.
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Reset
value
0x0
-
Reset
value
-
-