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void setup_tick()
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void setup_tick()
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{
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{
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    int cycles = SYSTEM_TICK / 100;
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    int cycles = SYSTEM_TICK / 100;
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    PWRCON &= ~(1 << 4);
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    /* configure timer for 10 kHz */
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    /* configure timer for 10 kHz */
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    TBCMD = (1 << 1);   /* TB_CLR */
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    TBCMD = (1 << 1);   /* TB_CLR */
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    TBPRE = 300 - 1;    /* prescaler */
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    TBPRE = 300 - 1;    /* prescaler */
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    TBCON = (0 << 13) | /* TB_INT1_EN */
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    TBCON = (0 << 13) | /* TB_INT1_EN */
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            (1 << 12) | /* TB_INT0_EN */
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            (1 << 12) | /* TB_INT0_EN */
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            (0 << 11) | /* TB_START */
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            (0 << 11) | /* TB_START */
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            (2 << 8) |  /* TB_CS = PCLK / 16 */
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            (2 << 8) |  /* TB_CS = PCLK / 16 */
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            (0 << 4);   /* TB_MODE_SEL = interval mode */
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            (0 << 4);   /* TB_MODE_SEL = interval mode */
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    TBDATA0 = cycles;   /* set interval period */
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    TBDATA0 = cycles;   /* set interval period */
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    TBCMD = (1 << 0);   /* TB_EN */
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    TBCMD = (1 << 0);   /* TB_EN */
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    /* enable timer interrupt */
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    INTMSK |= INTMSK_TIMER;
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}
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}
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void INT_TIMERB(void)
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void INT_TIMERB(void)
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{
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{
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    TBCON = TBCON;
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    TBCON = TBCON;