DSP56303 datasheet(203/292 Pages) FREESCALE

Nome de Peças	DSP56303

Descrição Electrónicos	DSP56303 USER?셎 MANUAL

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Fabricante Electrônico	FREESCALE [Freescale Semiconductor, Inc]

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Operating Modes

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

9-11

9.3.2 Signal Measurement Modes

The following signal measurement and pulse width modulation modes are provided:

Measurement input width (Mode 4)

Measurement input period (Mode 5)

Measurement capture (Mode 6)

Pulse width modulation (PWM) mode (Mode 7)

The external signal synchronizes with the internal clock that increments the counter. This

synchronization process can cause the number of clocks measured for the selected signal value to

vary from the actual signal value by plus or minus one counter clock cycle.

Figure 9-10. Event Counter Mode, TRM = 0

Mode 3 (internal clock): TRM = 0

N = write preload

M = write compare

(TIO pin or prescale CLK)

TLR

TCPR

TCF (Compare Interrupt if TCIE = 1)

first event

if clock source is from TIO pin,

TIO < CPUCLK + 4

Clock

Counter (TCR)

N + 1

M + 1

TOF (Overflow Interrupt if TCIE = 1)

NOTE: If INV = 1, counter is clocked on 1-to-0 clock transitions, instead of 0-to-1 transitions.

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