TMPR3916 datasheet(112/225 Pages) TOSHIBA

112 / 225 page

Chapter 5 TIMER

Preliminary

5-3

5.2

Periodic Timers

Both periodic timers are running all the time. Every time they reach the end of the interval, they cause an

interrupt. The interrupt is maskable in the Interrupt Controller (INTC). Both periodic timers use the same

prescaler.

Use the following formula to calculate the interval:

T0INT = interval settings of periodic timer 0 (see register description of TITR)

T1INT = interval settings of periodic timer 1 (see register description of TITR)

(T0INT + 8)

Interval of Timer 0

------------------------

× 1 / Prescaler

System frequency

(T1INT + 9)

Interval of Timer 1

------------------------

× 1 / Prescaler

System frequency

Note that at the same settings timer 0 has twice the speed of timer 1.

Example:

T0INT = interval setting of Periodic Timer 0 = 010 (bin) = 2 (dec)

TPRE = prescaler setting = 100 (bin)

⇒

Prescaler = 1 / 32 (dec)

(2 + 8)

32768

Interval of Timer 0

--------------

× 32 =

------------

= 0.55 msec

60 MHz

Name

Phys. Address (hex)

Function

TIMER

1C01 0000

16 bit free-running counter

TITR

1C01 0004

Settings for periodic timer

TIMER Register (TIMER)

Bit

Name

TVAL



Bit

Name

Function

Reset

Value

R/W

31:16

TVAL

Free running counter

The free running counter provides the periodic timers. The counter

operates continuously on output clock of the prescaler. Write this

0x0000

R/W

15:0

Wired to zero

0x0000

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