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7470 Datasheet, PDF (33/47 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER | |||
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MITSUBISHI MICROCOMPUTERS
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
<An example of flow for system>
Power on reset
â
Clock X oscillation
â
Internal system clock start (Xâ1/2â Ï)
â
Program start from RESET vector
Normal program â Operating at f(XIN)
Clock for clock function XC oscillation start (CM4 = 1, CM5 = 1)
â
Latency time for oscillation to stabilize (by program) â Operating at f(XIN)
â
XC clock power down (CM5 : 1â0)
â
Internal clock Ï source switching XâXC (CM7 : 0â1)
â
Clock X halt (XC in operation) (CM6 = 1)
â
Internal clock halt (WIT instruction)
â
Timer 4 (clock count) overflow
â
Internal clock operation start (WIT instruction released)
Clock processing routine â Operating at f(XCIN)
Internal clock halt (WIT instruction)
Interrupts from INT0, INT1, CNTR0/CNTR1, timer 1, timer 2, timer 3, timer 4, serial I/O, key on wake up
â
Internal clock operation start (WIT instruction released)
â
Program start from interrupt vector
â
Clock X oscillation start (CM6 = 0)
â
Latency time for oscillation to stabilize (by program) â Operating at f(XCIN)
â
Internal clock Ï source switching (XCâX) (CM7 : 1â0)
Normal program â Operating at f(XIN)
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