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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1066 of 1441
NXP Semiconductors
UM10503
Chapter 34: LPC43xx/LPC43Sxx Quadrature Encoder Interface (QEI)
34.5 Pin description
34.6 Register description
Table 826. QEI pin description
Pin
function
I/O
Description
QEI_A
I
Used as the Phase A (PhA) input to the Quadrature Encoder Interface.
QEI_B
I
Used as the Phase B (PhB) input to the Quadrature Encoder Interface.
QEI_IDX
I
Used as the Index (IDX) input to the Quadrature Encoder Interface.
Table 827. Register overview: QEI (base address 0x400C 6000)
Name
Access
Address
offset
Description
Reset value
Reference
Control registers
CON
WO
0x000
Control register
0
STAT
RO
0x004
Encoder status register
0
CONF
R/W
0x008
Configuration register
0x000F 0000
Position, index, and timer registers
POS
RO
0x00C
Position register
0
MAXPOS
R/W
0x010
Maximum position register
0
CMPOS0
R/W
0x014
position compare register 0
0xFFFF FFFF
CMPOS1
R/W
0x018
position compare register 1
0xFFFF FFFF
CMPOS2
R/W
0x01C
position compare register 2
0xFFFF FFFF
INXCNT
RO
0x020
Index count register
0
INXCMP0
R/W
0x024
Index compare register 0
0xFFFF FFFF
LOAD
R/W
0x028
Velocity timer reload register
0xFFFF FFFF
TIME
RO
0x02C
Velocity timer register
0xFFFF FFFF
VEL
RO
0x030
Velocity counter register
0
CAP
RO
0x034
Velocity capture register
0xFFFF FFFF
VELCOMP
R/W
0x038
Velocity compare register
0
FILTERPHA R/W
0x03C
Digital filter register on input
phase A (QEI_A)
0
FILTERPHB R/W
0x040
Digital filter register on input
phase B (QEI_B)
0
FILTERINX
R/W
0x044
Digital filter register on input
index (QEI_IDX)
0
WINDOW
R/W
0x048
Index acceptance window
register
0x0000 0000
INXCMP1
R/W
0x04C
Index compare register 1
0xFFFF FFFF
INXCMP2
R/W
0x050
Index compare register 2
0xFFFF FFFF
Interrupt registers
IEC
WO
0xFD8
Interrupt enable clear register
0
IES
WO
0xFDC
Interrupt enable set register
0