LPC2917 datasheet(32/68 Pages) PHILIPS

32 / 68 page

LPC2917_19_1

Preliminary data sheet

Rev. 1.01 — 15 November 2007

32 of 68

NXP Semiconductors

LPC2917/19

ARM9 microcontroller with CAN and LIN

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 8.8.4.

8.7.2.1

Synchronization and trigger features of the MSCSS

The MSCSS contains two internal timers to generate synchronization and carrier pulses

for the ADCs and PWMs. Figure 8 shows how the timers are connected to the ADC and

PWM modules.

Fig 7.

Modulation and sampling control subsystem block diagram

002aad348

PWM0 MAT[5:0]

PWM1 MAT[5:0]

PWM2 MAT[5:0]

PWM3 MAT[5:0]

ADC

3.3 V

ADC

3.3 V

PWM

MSCSS

TIMER 1

PWM

CONTROL

CARRIERS

MSCSS

TIMER 0

ADC

CONTROL

SYNCS

AHB2VPB

BRIDGE

PWM

AHB

system bus

VPB sub system bus

(to all sub blocks)

ADC2 IN[7:0]

ADC2_EXT_START

ADC1 IN[7:0]

ADC1_EXT_START

ADC clock

PWM0 TRAP

PWM0 CAP[2:0]

PWM1 TRAP

PWM1 CAP[2:0]

PWM2 TRAP

PWM2 CAP[2:0]

PWM3 TRAP

PWM3 CAP[2:0]

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