Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 123)

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MAXQ7667 User’s Guide

T2P0 PIN

CODE EXECUTION:

POINT A

CODE EXECUTION:

POINT B

1B 2B

EVENTS:

1A: FALLING EDGE CAUSES CAPTURE/RELOAD; SINGLE-SHOT CAPTURE CYCLE BEGINS.

2A: FALLING EDGE CAUSES CAPTURE/RELOAD; SINGLE-SHOT CAPTURE CYCLE ENDS; PERIOD = T2C0.

1B AND 2B: SAME SEQUENCE AS 1A–2A, EXCEPT THAT THE SINGLE-SHOT CAPTURE CYCLE DOES NOT BEGIN UNTIL THE FIRST FALLING EDGE IS DETECTED.

Figur

e 6-10. T

ype 2 T

imer Application Example—Measure Period

6.7.9.3 Measure Period

To measure the period of the signal seen on the T2P0 input pin, the Type 2 timer is configured for a single-shot capture, no gating,

either edge (selected by the CCF[1:0] bits). The CPRL2 bit can be set to generate a reload on each capture edge.

;

------------------ Reset State: T2R0 = T2V0 = T2C0 = 0000h ------------------------

MOVE T2CFG0, #00000100b ; T2CI =0 (sysclk/N input)

; T2DIV2:0 =000 (/1)

; T2MD =0 (16-bit)

; CCF1:0 =10 (falling edge)

; C/T2 =0 (timer/capture)

MOVE T2CNA0, #10000110b ; ET2 =1 (enable Type 2 Timer ints)

; T2OE0 =0 (input)

; T2POL0 =0 (gating level = ‘0’)

; TR2L:TR2 =00 (don’t start timer )

; CPRL2 =1 (reload on capture edge)

; SS2 =1 (single shot mode)

; G2EN =0 (gating disabled)

; ------------------ TCC2 Interrupt : PERIOD = T2C0

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Maxim-integrated MAXQ7667 Manual do Utilizador Página 123