Motorola M68HC08 manual Function TIMACh3Int

Freescale Semiconductor, Inc.

Software Design

Implementation Notes

•The value T2 (e.g., T2 = T_Cmt + Per_HlfCmt) is calculated using a 16-bit addition with no saturation. So, the time duration up to 65,536 UNIT_PERIOD_T2_US from actual time (TACNTH, TACNTL) can be timed at any TACNTH, TACNTL timer A counter value.

•The timer unit UNIT_PERIOD_T2_US of timer A is determined by the MCU bus frequency (8 MHz with 4-MHz oscillator and default

software setting) and timer prescaler set in TASC. So, the default software value is 2 ∝s. The timer 2 interrupt function is provided by

function TIMACh3_Int().

Freescale Semiconductor, Inc.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Software Design	107
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