LPC2917/01 NXP [NXP Semiconductors], LPC2917/01 Datasheet - Page 45

• Manufacturer Part Number: LPC2917/01
• Description: ARM9 microcontroller with CAN and LIN
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
LPC2917_19_01_2
Preliminary data sheet
6.14.7.1 Pin description
6.14.7.2 Clock description
6.15 Power, clock and reset control subsystem
The QEI has the following features:
The QEI module in the MSCSS has the following pins. These are combined with other
functions on the port pins of the LPC2917/2919/01.
Table 25.
The QEI module is clocked by CLK_MSCSS_QEI, see
this clock is identical to CLK_MSCSS_APB since they are derived from the same base
clock BASE_MSCSS_CLK.
If the QEI is not used its CLK_MSCSS_QEI branch clock can be switched off.
The Power, Clock, and Reset Control Subsystem (PCRSS) in the LPC2917/2919/01
includes the Clock Generator Units (CGU0 and CGU1), a Reset Generator Unit (RGU)
and a Power Management Unit (PMU).
Figure 11
communication with the AHB system bus.
Symbol
QEI0 IDX
QEI0 PHA
QEI0 PHB
•
•
•
•
•
•
•
•
•
•
•
•
•
Tracks encoder position.
Increments/ decrements depending on direction.
Programmable for 2X or 4X position counting.
Velocity capture using built-in timer.
Velocity compare function with less than interrupt.
Uses 32-bit registers for position and velocity.
Three position compare registers with interrupts.
Index counter for revolution counting.
Index compare register with interrupts.
Can combine index and position interrupts to produce an interrupt for whole and
partial revolution displacement.
Digital filter with programmable delays for encoder input signals.
Can accept decoded signal inputs (clk and direction).
Connected to APB.
provides an overview of the PCRSS. An AHB-to-DTL bridge provides
QEI pins
Pin name
IDX0
PHA0
PHB0
Rev. 02 — 17 June 2009
Direction
IN
IN
IN
LPC2917/01; LPC2919/01
Description
Index signal. Can be used to reset the position.
Sensor signal. Corresponds to PHA in
quadrature mode and to direction in
clock/direction mode.
Sensor signal. Corresponds to PHB in
quadrature mode and to clock signal in
clock/direction mode.
ARM9 microcontroller with CAN and LIN
Table 25
Section
shows the QEI pins.
6.7.2. The frequency of
© NXP B.V. 2009. All rights reserved.
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