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UPD750064CU Datasheet(PDF) 27 Page - NEC |
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UPD750064CU Datasheet(HTML) 27 Page - NEC |
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27 / 82 page  27 µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A) Data Sheet U10165EJ2V0DS00 6.5 Basic Interval Timer/Watchdog Timer The basic interval timer/watchdog timer has the following functions. (a) Interval timer operation to generate a reference time interrupt (b) Watchdog timer operation to detect a runaway of program and reset the CPU (c) Selects and counts the wait time when the standby mode is released (d) Reads the contents of counting Figure 6-4. Basic Interval Timer/Watchdog Timer Block Diagram From clock generator fX/25 fX/27 fX/29 fX/212 MPX BTM3 BTM2 BTM1 BTM0 BTM 4 SET1Note Internal bus 81 Basic interval timer (8-bit frequency divider) Clear BT Wait release signal when standby is released Set Clear 3 WDTM SET1Note Internal reset signal Vectored interrupt request signal BT interrupt request flag IRQBT Note Instruction execution |
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