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UPD75004 Datasheet(PDF) 23 Page - NEC |
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UPD75004 Datasheet(HTML) 23 Page - NEC |
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23 / 66 page  µPD75004, 75006, 75008 23 5.4 BASIC INTERVAL TIMER The basic interval timer has these functions: • Interval timer operation which generates a reference time interrupt • Watchdog timer application which detects a program runaway • Selects the wait time for releasing the standby mode and counts the wait time • Reads out the count value Remarks : *: Instruction execution Fig. 5-3 Basic Interval Timer Configuration From the clock generator fX/25 fX/27 fX/29 fX/212 MPX Clear Basic interval timer (8-bit frequency divider circuit) 3 4 8 BT Clear Set signal BT interrupt request flag IRQBT Wait release signal for standby release Vector interrupt request signal Internal bus BTM3 BTM2 BTM1 BTM0 BTM SET1* |
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