7477 datasheet(35/48 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

7477/ 7478 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Power on reset

↓

Clock X oscillation

↓

Internal system clock start (X

→1/2→ φ)

↓

Program star t from RESET vector

Normal program

Operating at f(XIN)

Clock for clock function XC oscillation start (CM4 = 1, CM5 = 1)

↓

Latency time for oscillation to stabilize (by program)

← Operating at f(XIN)

↓

XC clock power down (CM5 : 1→0)

↓

Internal clock

φ source switching X→XC (CM7 : 0→1)

↓

Clock X halt (XC in operation) (CM6 = 1)

↓

Internal clock halt (WIT instruction)

↓

Timer 4 (clock count) overflow

↓

Internal clock operation star t (WIT instruction released)

Clock processing routine

← 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

↓

Internal clock operation star t (WIT instruction released)

↓

Program star t from interrupt vector

↓

Clock X oscillation start (CM6 = 0)

↓

Latency time for oscillation to stabilize (by program)

← Operating at f(XCIN)

↓

Internal clock

φ source switching (XC→X) (CM7 : 1→0)

Normal program

→ Operating at f(XIN)

7477 Datasheet(PDF) 35 Page - Renesas Technology Corp

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