MB90F482 datasheet(62/113 Pages) FUJITSU

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MB90480/485 Series

15. Timebase Timer

The timebase timer is an 18-bit free run counter (timebase counter) that counts up in synchronization with the

internal count clock signal (base oscillator

× 2) , and functions as an interval timer with a choice of four types of

time intervals. Other functions provided by this module include timer output for the oscillator stabilization wait

period, and operating clock signal feed for other timer circuits such as the watchdog timer.

(1) Register List

(2) Block Diagram

Timebase timer control register (TBTC)

0000A9H

Read/write

Initial value



R/W



R/W

RESV



TBIE

TBOF

TBR

TBC1

TBC0

TBIE TBOF TBR

RESV



TBC1 TBC0

× 21 × 22

× 28 × 29 × 210 × 211 × 212 × 213 × 214 × 215 × 216 × 217 × 218

to PPG timer

Timebase

timer counter

HCLK

× 2

To watchdog

timer

Power-on reset

Counter

clear

control

circuit

Interval timer

selector

TBOF clear

Timebase timer control register (TBTC)

Timebase timer interrupt signal

Clock control module

Oscillator stabilization

wait

To time selector

TBOF

set



: Not used

: Overflow

HCLK : Oscillator clock

: Switch machine clock from main clock or sub clock to PLL clock.

: Switch machine clock from sub clock to main clock.

Stop mode start

Hold status start

CKSCR : MCS

= 1→0*1

CKSCR : SCS

= 0→1*2

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