LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 546

• Manufacturer Part Number: LPC1767FBD100,551
• Description: IC ARM CORTEX MCU 512K 100-LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC17xxr

Specifications of LPC1767FBD100,551

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x12b, D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: LPC17
• Core: ARM Cortex M3
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
• For Use With: 622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-4967; 935289808551

NXP Semiconductors
UM10360
User manual
Fig 129.Quadrature Encoder Basic Operation
direction
position
PhA
PhB
26.4.1.2 Digital input filtering
26.4.2 Position capture
26.4.3 Velocity capture
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Table 481. Encoder direction
Figure 129
All three encoder inputs (PhA, PhB, and index) require digital filtering. The number of
sample clocks is user programmable from 1 to 4,294,967,295 (0xFFFF FFFF). In order for
a transition to be accepted, the input signal must remain in new state for the programmed
number of sample clocks.
The capture mode for the position integrator can be set to update the position counter on
every edge of the PhA signal or to update on every edge of both PhA and PhB. Updating
the position counter on every PhA and PhB provides more positional resolution at the cost
of less range in the positional counter.
The position integrator and velocity capture can be independently enabled. Alternatively,
the phase signals can be interpreted as a clock and direction signal as output by some
encoders.
The position counter is automatically reset on one of two conditions. Incrementing past
the maximum position value (QEIMAXPOS) will reset the position counter to zero. If the
reset on index bit (
zero.
The velocity capture has a programmable timer and a capture register. It counts the
number of phase edges (using the same configuration as for the position integrator) in a
given time period. When the velocity timer (QEITIME) overflows the contents of the
velocity counter (QEIVEL) are transferred to the capture (QEICAP) register. The velocity
counter is then cleared. The velocity timer is loaded with the contents of the velocity
reload register (QEILOAD). Finally, the velocity interrupt (TIM_Int) is asserted. The
DIR bit
0
1
0
1
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-1
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shows how quadrature encoder signals equate to direction and count.
All information provided in this document is subject to legal disclaimers.
DIRINV bit
0
0
1
1
RESPI
+1 +1 +1 +1 +1 +1 +1 +1
Rev. 2 — 19 August 2010
) is set, sensing the index pulse will reset the position counter to
Chapter 26: LPC17xx Quadrature Encoder Interface (QEI)
direction
forward
reverse
reverse
forward
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UM10360
© NXP B.V. 2010. All rights reserved.
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