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HMS81004E Datasheet(PDF) 49 Page - Hynix Semiconductor |
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HMS81004E Datasheet(HTML) 49 Page - Hynix Semiconductor |
49 / 77 page HMS81004E/08E/16E/24E/32E 46 JUNE 2001 Ver 1.00 3) Single/Modulo-N Mode Timer0 (Timer1) can select initial (T0INIT, T1INIT of TM01) output level of Timer Output port. If initial level is “L”, Low-Data Register value of Timer Data Register is transferred to comparator and T0OUT (T1OUT) is to be “Low”, if initial level is High? High -Data Register is transferred and to be “High”. Single Mode can be set by Mode Select bit (T0MOD, T1MOD) of Timer Mode Reg- ister (TM0, TM1) to “1” When used as Single Mode, Tim- er counts up and compares with value of Data Register. If the result is same, Time Out interrupt occurs and level of Timer Output port toggle, then counter stops as reset state. When used as Modulo-N Mode, T0MOD (T1MOD) should be set “0”. Counter counts up until the value of Data Register and occurs Time-out interrupt. The level of Timer Output port toggle and repeats process of counting the value which is selected in Data Register. During Modulo-N Mode, If interrupt select bit (T0IFS, T1IFS) of Mode Register is “0”, Interrupt occurs on every Time-out. If it is “1”, Interrupt occurs every second time- out. Note: Timer Output is toggled whenever time out happen (4) Timer 2 Timer2 operates as a up-counter. The content of T2DR are compared with the contents of up-counter. If a match is found. Timer2 interrupt (IFT2) is generated and the up- counter is cleared to “00h”. Therefore, Timer2 executes as a interval timer. Interrupt period is determined by the count source clock for the Timer2 and content of T2DR. When T2ST is set to “1”, count value of Timer 2 is cleared and starts counting-up. For clearing and starting the Timer2. T2ST have to set to “1” after set to “0”. In order to write a value directly into the T2DR, T2ST should be set to “0”. Count value of Timer2 can be read at any time. Figure 13-8 Operation Diagram for Single/Modulo-N Mode [ Single Mode ] [ Module-N Mode ] 8bit/16bit Timer Enable initial 8bit/16bit counting value toggle counting Timer Enable initial value toggle Timer-output toggle Int occurs (IFS=1) Each 2nd time out Int occurs (IFS=0) when Time out |
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