NXP Semiconductors LPC43 Series User Manual

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NXP Semiconductors LPC43 Series User Manual Manual pdf 859 page image

UM10503 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.User manual Rev. 1.3 — 6 July 2012 859 of 1269NXP Semiconductors UM10503Chapter 29: LPC43xx Timer0/1/2/329.6.10 Timer external match registersThe External Match Register provides both control and status of the external match pins.In the descriptions below, “n” represents the Timer number, 0 or 1, and “m” represent aMatch number, 0 through 3.Match events for Match 0 and Match 1 in each timer can cause a DMA request, seeSection 29.7.2.Table 693. Timer external match registers (EMR - addresses 0x4008 403C (TIMER0),0x4008 503C (TIMER1), 0x400C 303C (TIMER2), 0x400C 403C (TIMER3)) bitdescriptionBit Symbol Value Description Resetvalue0 EM0 External Match 0. When a match occurs between the TC andMR0, this bit can either toggle, go low, go high, or do nothing,depending on bits 5:4 of this register. This bit can be drivenonto a MATn.0 pin, in a positive-logic manner (0 = low,1 = high).01 EM1 External Match 1. When a match occurs between the TC andMR1, this bit can either toggle, go low, go high, or do nothing,depending on bits 7:6 of this register. This bit can be drivenonto a MATn.1 pin, in a positive-logic manner (0 = low,1 = high).02 EM2 External Match 2. When a match occurs between the TC andMR2, this bit can either toggle, go low, go high, or do nothing,depending on bits 9:8 of this register. This bit can be drivenonto a MATn.0 pin, in a positive-logic manner (0 = low,1 = high).03 EM3 External Match 3. When a match occurs between the TC andMR3, this bit can either toggle, go low, go high, or do nothing,depending on bits 11:10 of this register. This bit can be drivenonto a MATn.0 pin, in a positive-logic manner (0 = low,1 = high).05:4 EMC0 External Match Control 0. Determines the functionality ofExternal Match 0.000x0 Do Nothing.0x1 Clear the corresponding External Match bit/output to 0(MATn.m pin is LOW if pinned out).0x2 Set the corresponding External Match bit/output to 1 (MATn.mpin is HIGH if pinned out).0x3 Toggle the corresponding External Match bit/output.7:6 EMC1 External Match Control 1. Determines the functionality ofExternal Match 1.000x0 Do Nothing.0x1 Clear the corresponding External Match bit/output to 0(MATn.m pin is LOW if pinned out).0x2 Set the corresponding External Match bit/output to 1 (MATn.mpin is HIGH if pinned out).0x3 Toggle the corresponding External Match bit/output.