OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 248

• 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
Table 229. External Match Register (EMR, address 0x4001 003C (CT16B0) and 0x4001 403C (CT16B1)) bit
Table 230. External match control
UM10441
User manual
Bit
7:6 EMC1
9:8 EMC2
11:
10
31:
12
EMR[11:10], EMR[9:8],
EMR[7:6], or EMR[5:4]
Symbol
EMC3
-
13.7.10.1 DMA operation
description
00
01
10
11
Value Description
0x0
0x1
0x2
0x3
0x0
0x1
0x2
0x3
0x0
0x1
0x2
0x3
DMA requests are generated by 0 to 1 transitions of the External Match 0 bit of each timer.
In order to have an effect, the GPDMA must be configured and the relevant timer DMA
request selected as a DMA source. When a timer is initially set up to generate a DMA
request, the request may already be asserted before a match condition occurs. An initial
DMA request may be avoided by having software write a one to clear the timer interrupt
flag. A DMA request will be automatically cleared via hardware by the DMA controller after
servicing.
External Match Control 1. Determines the functionality of External Match 1.
Do Nothing.
Clear the corresponding External Match bit/output to 0 (CT16Bi_MAT1 pin is LOW if
pinned out).
Set the corresponding External Match bit/output to 1 (CT16Bi_MAT1 pin is HIGH if pinned
out).
Toggle the corresponding External Match bit/output.
External Match Control 2. Determines the functionality of External Match 2.
Do Nothing.
Clear the corresponding External Match bit/output to 0 (CT16Bi_MAT2 pin is LOW if
pinned out).
Set the corresponding External Match bit/output to 1 (CT16Bi_MAT2 pin is HIGH if pinned
out).
Toggle the corresponding External Match bit/output.
External Match Control 3. Determines the functionality of External Match 3.
shows the encoding of these bits.
Do Nothing.
Clear the corresponding External Match bit/output to 0 (CT16Bi_MAT3 pin is LOW if
pinned out).
Set the corresponding External Match bit/output to 1 (CT16Bi_MAT3 pin is HIGH if pinned
out).
Toggle the corresponding External Match bit/output.
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
Function
Do Nothing.
Clear the corresponding External Match bit/output to 0 (CT16Bn_MATm pin is LOW if
pinned out).
Set the corresponding External Match bit/output to 1 (CT16Bn_MATm pin is HIGH if
pinned out).
Toggle the corresponding External Match bit/output.
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 10 March 2011
Chapter 13: LPC122x 16-bit Counter/timer 0/1 (CT16B0/1)
Table 230
UM10441
© NXP B.V. 2011. All rights reserved.
248 of 442
Reset
value
00
00
00
NA