lpc2917 NXP Semiconductors, lpc2917 Datasheet - Page 32

• Manufacturer Part Number: lpc2917
• Description: Arm9 Microcontroller With Can And Lin
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2917_19_1
Preliminary data sheet
Fig 7. Modulation and sampling control subsystem block diagram
system bus
AHB
ADC2_EXT_START
ADC1_EXT_START
8.7.2.1 Synchronization and trigger features of the MSCSS
PWM0 CAP[2:0]
PWM1 CAP[2:0]
PWM2 CAP[2:0]
PWM3 CAP[2:0]
PWM0 TRAP
PWM1 TRAP
PWM2 TRAP
PWM3 TRAP
ADC2 IN[7:0]
ADC1 IN[7:0]
AHB2VPB
BRIDGE
ADC clock
control. Several other trigger possibilities are provided for the ADCs (external, cascaded
or following a PWM). The capture inputs of both timers can also be used to capture the
start pulse of the ADCs.
The PWMs can be used to generate waveforms in which the frequency, duty cycle and
rising and falling edges can be controlled very precisely. Capture inputs are provided to
measure event phases compared to the main counter. Depending on the applications,
these inputs can be connected to digital sensor motor outputs or digital external signals.
Interrupt signals are generated on several events to closely interact with the CPU.
The ADCs can be used for any application needing accurate digitized data from analog
sources. To support applications like motor control, a mechanism to synchronize several
PWMs and ADCs is available (sync_in and sync_out).
Note that the PWMs run on the PWM clock and the ADCs on the ADC clock, see
Section
The MSCSS contains two internal timers to generate synchronization and carrier pulses
for the ADCs and PWMs.
PWM modules.
VPB sub system bus
(to all sub blocks)
8.8.4.
Rev. 1.01 — 15 November 2007
CARRIERS
CONTROL
CONTROL
TIMER 0
TIMER 1
MSCSS
MSCSS
SYNCS
PWM
ADC
Figure 8
shows how the timers are connected to the ADC and
PWM
0
PWM
1
ARM9 microcontroller with CAN and LIN
PWM
3.3 V
ADC
2
1
PWM
3.3 V
ADC
LPC2917/19
3
2
PWM0 MAT[5:0]
PWM1 MAT[5:0]
PWM2 MAT[5:0]
PWM3 MAT[5:0]
© NXP B.V. 2007. All rights reserved.
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