UM10503
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User manual
Rev. 1.3 — 6 July 2012
902 of 1269
NXP Semiconductors
UM10503
Chapter 31: LPC43xx Quadrature Encoder Interface (QEI)
31.6.2.11 QEI Velocity Capture register
This register contains the most recently measured velocity of the encoder. This
corresponds to the number of velocity pulses counted in the previous velocity timer
period.The current velocity count is latched into this register when the velocity timer
overflows.
31.6.2.12 QEI Velocity Compare register
This register contains a velocity compare value. This value is compared against the
captured velocity in the velocity capture register. If the capture velocity is less than the
value in this compare register, a velocity compare interrupt (VELC_Int) will be asserted, if
enabled.
31.6.2.13 QEI Digital filter on phase A input register
This register contains the sampling count for the digital filter. A sampling count of zero
bypasses the filter.
31.6.2.14 QEI Digital filter on phase B input register
This register contains the sampling count for the digital filter. A sampling count of zero
bypasses the filter.
31.6.2.15 QEI Digital filter on index input register
This register contains the sampling count for the digital filter. A sampling count of zero
bypasses the filter.
Table 738. QEI Velocity Capture register (CAP - address 0x400C 6034) bit description
Bit
Symbol
Description
Reset value
31:0
VELCAP
Velocity capture value.
0xFFFF FFFF
Table 739. QEI Velocity Compare register (VELCOMP - address 0x400C 6038) bit description
Bit
Symbol
Description
Reset value
31:0
VELCMP
Velocity compare value.
0x0
Table 740. QEI Digital filter on phase A input register (FILTERPHA - 0x400C 603C) bit
description
Bit
Symbol
Description
Reset
value
31:0
FILTA
Digital filter sampling delay
0x0
Table 741. QEI Digital filter on phase B input register (FILTERPHB - 0x400C 6040) bit
description
Bit
Symbol
Description
Reset
value
31:0
FILTB
Digital filter sampling delay
0x0
Table 742. QEI Digital filter on index input register (FILTERINX - 0x400C 6044) bit
description
Bit
Symbol
Description
Reset
value
31:0
FITLINX
Digital filter sampling delay
0x0