3819 datasheet(92/218 Pages) RENESAS

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3819 Group USER’S MANUAL

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.2 Timer

(2) Timer application example 1: Clock function (measurement of one second)

Outline : The input clock is divided by a timer so that the clock counts up every second.

Specifications :

• The clock f(XIN) = 4.19 MHz (2

) is divided by a timer.

• The Timer 3 interrupt request bit is checked in the main routine, and the clock is counted

up when an interrupt request occurs.

• Another interrupt processing is executed in a parallel, so a timer interrupt occurs every

244

µs.

Figure 2.2.11 shows a connection of timers and a setting of division ratios, Figures 2.2.12 and 2.2.13 show a setting

of related registers, and Figure 2.2.14 shows a control procedure.

Fig. 2.2.11 Connection of timers and setting of division ratios [Clock function]

Fig. 2.2.12 Setting of related registers (1) [Clock function]

000

00 1

Timer 1 count : Stopped

Set to "0" at starting to count

Timer 2 count : Operating

Timer 1 count source : f(X IN)/16

Timer 2 count source : Timer 1 underflow

Timer 1 output selection : I/O port

T12M

Timer 12 mode register (Address:28 16)

Timer 3 count source : Timer 2 underflow

Timer 3 output selection : I/O port

Timer 3 count : Operating

T34M

Timer 34 mode register (Address:29 16)

Timer 3 interrupt request bit

1/16

0 or 1

1/256

1/16

f(XIN) =

4.19 MHz

Fixed

Timer 1

Timer 2

Timer 3

1 second

244

µs

Timer 1 interrupt request bit

1/64

0 or 1

0 : No interrupt request

1 : Interrupt request

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