UM10503
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User manual
Rev. 1.3 — 6 July 2012
903 of 1269
NXP Semiconductors
UM10503
Chapter 31: LPC43xx Quadrature Encoder Interface (QEI)
31.6.2.16 QEI Index acceptance window register
This register contains the width of the index acceptance window, when the index and the
phase / clock edges fall nearly together. If the activating phase / clock edge falls before
the Index, but within the window, the (re)calibration will be activated on that clock/phase
edge.
31.6.2.17 QEI Index Compare register 1
This register contains an index compare value. This value is compared against the current
value of the index count register. Interrupts can be enabled to interrupt when the compare
value is less than, equal to, or greater than the current value of the index count register.
31.6.2.18 QEI Index Compare register 2
This register contains an index compare value. This value is compared against the current
value of the index count register. Interrupts can be enabled to interrupt when the compare
value 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 description
Bit
Symbol
Description
Reset
value
31:0
WINDOW
Index acceptance window width
0x0
Table 744. QEI Index Compare register 1 (INXCMP1 - address 0x400C 604C) bit description
Bit
Symbol
Description
Reset value
31:0
ICMP1
Index compare value 1.
0xFFFF FFFF
Table 745. QEI Index Compare register 2 (INXCMP2 - address 0x400C 6050) bit description
Bit
Symbol
Description
Reset value
31:0
ICMP2
Index compare value 2.
0xFFFF FFFF