SEC2410 datasheet(85/283 Pages) MICROCHIP

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DS00001587C-page 85

SEC2410/SEC4410

11.6.4.2

Period Measurements

The timers in the SEC2410/SEC4410 measure the period of a signal by counting the number of timer clocks between

either rising or falling edges of the TINx input. The measurement edge is determined by bits in the Clock and Event

Control Register. The timer starts measuring on the next edge (rising or falling) on the TINx pin after the ENABLE bit is

set. The reload register stores the result of the last measurement taken. If the timer overflows, 0x0000 is written to the

reload register. Figure 11-11 shows the timer behavior when measuring the period of a signal.

The timer will not signal an interrupt in period measurement mode until the timer detects either two rising edges or two

falling edges.

11.7

16-Bit Counter/Timer Interface Register Summary

There are four instances of the 16-Bit Timer/Counter Block implemented in the SEC2410/SEC4410 enumerated as [0:3]

with an overflow/underflow interface. Each instance of the 16-Bit Timer/Counter Block has its Base Address as indicated

in Table 11-7.

FIGURE 11-11:

PULSE PERIOD MEASUREMENT

TABLE 11-7:

16-BIT COUNTER/TIMER INTERFACE BASE ADDRESS TABLE

16-Bit Timer/Counter Block

Instance

EC Bus Address Offset

(Base = 0x40020000)

16-bit Timer.0

0x0C00

16-bit Timer.1

0x0C80 = 0x0C00 + 0x80

16-bit Timer.2

0x0D00 = 0x0C00 + 0x100

16-bit Timer.3

0x0D80 = 0x0C00h + 0x180

Timer Value

TIN

Timer Clock

0x000

Timer Enable Bit

0x000

0xFFF

0x000

Timer Reload

Timer Interrupt

0x000

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