Samsung 8-Bit Instrukcja Użytkownika Pobierz pdf (Strona 184)

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101

TIMER 1 S3C9228/P9228

11-4

TWO 8-BIT TIMERS MODE (TIMER A and B)

OVERVIEW

The 8-bit timer A and B are the 8-bit general-purpose timers. Timer A and B have the interval timer mode by

using the appropriate TACON and TBCON setting, respectively.

Timer A and B have the following functional components:

— Clock frequency divider with multiplexer

– fxx divided by 512, 256, 64, 8 or 1, fxt, and T1CLK (External clock) for timer A

– fxx divided by 512, 256, 64, 8 or 1, and fxt for timer B

— 8-bit counter (TACNT, TBCNT), 8-bit comparator, and 8-bit reference data register (TADATA, TBDATA)

— Timer A have I/O pin for match output (TAOUT)

— Timer A match interrupt generation

— Timer A control register, TACON (page 0, BBH, read/write)

— Timer B match interrupt generation

— Timer B control register, TBCON (page 0, BAH, read/write)

Timer A and B Control Register (TACON, TBCON)

You use the timer A and B control register, TACON and TBCON, to

— Enable the timer A (interval timer mode) and B operating (interval timer mode)

— Select the timer A and B input clock frequency

— Clear the timer A and B counter, TACNT and TBCNT

— Enable the timer A and B interrupt

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