NXP Semiconductors LPC43 Series User Manual

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NXP Semiconductors LPC43 Series User Manual Manual pdf 903 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 903 of 1269NXP Semiconductors UM10503Chapter 31: LPC43xx Quadrature Encoder Interface (QEI)31.6.2.16 QEI Index acceptance window registerThis register contains the width of the index acceptance window, when the index and thephase / clock edges fall nearly together. If the activating phase / clock edge falls beforethe Index, but within the window, the (re)calibration will be activated on that clock/phaseedge.31.6.2.17 QEI Index Compare register 1This register contains an index compare value. This value is compared against the currentvalue of the index count register. Interrupts can be enabled to interrupt when the comparevalue is less than, equal to, or greater than the current value of the index count register.31.6.2.18 QEI Index Compare register 2This register contains an index compare value. This value is compared against the currentvalue of the index count register. Interrupts can be enabled to interrupt when the comparevalue is less than, equal to, or greater than the current value of the index count register.Table 743. QEI Index acceptance window register (WINDOW - 0x400C 6048) bit descriptionBit Symbol Description Resetvalue31:0 WINDOW Index acceptance window width 0x0Table 744. QEI Index Compare register 1 (INXCMP1 - address 0x400C 604C) bit descriptionBit Symbol Description Reset value31:0 ICMP1 Index compare value 1. 0xFFFF FFFFTable 745. QEI Index Compare register 2 (INXCMP2 - address 0x400C 6050) bit descriptionBit Symbol Description Reset value31:0 ICMP2 Index compare value 2. 0xFFFF FFFF