M38005M2DXXXFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38005M2DXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPLICATION

2.2 Timer

(5) Timer application example 4 : Measurement of pulse width of FG pulse generated by motor

Outline : The “H” level width of a pulse input to the P54/CNTR0 pin is counted by Timer X. An

underflow is detected by Timer X interrupt and an end of the input pulse “H” level is detected

by CNTR0 interrupt.

Specifications : • The “H” level width of a FG pulse input to the P54/CNTR0 pin is counted by Timer

X.

(Example : When the clock frequency is 4.19 MHz, the count source would be

3.8 µs that is obtained by dividing the clock frequency by 16.

Measurement can be made up to 250 ms in the range of FFFF16 to

000016.)

Figure 2.2.20 shows a connection of the timer and a setting of the division ratio, and Figure 2.2.21

shows a setting of related registers.

f(XIN) = 4.19 MHz

Fixed

1/16

Prescaler X

1/256

Timer X Timer X interrupt request bit

1/256

0 or 1

250 ms

0 : No interrupt request

1 : Interrupt request

Fig. 2.2.20 Connection of the timer and setting of the division ratio [Measurement of pulse width]

2-20

3800 GROUP USER’S MANUAL

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