Chapter 2 CPU Basics

„Sequence at Reset

(1)When reset pin comes to high level from low level, the innternal 14-bit counter (It can be used as watchdog timer, too.) starts its operation by system clock. The period from starting its count from its overflow is called oscillation stabilization wait time.

(2)During reset, internal register and special function register are initiated.

(3)After oscillation stabilization wait time, internal reset is released and program is started from the address written at address X '4000' at interrupt rector table.

VDD

NRST

OSC2/XO

internal RST Oscillation stabilization

wait time

Figure 2-8-2 Reset Released Sequence

Reset II - 39

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Panasonic F77G, MN101C77C user manual Reset Released Sequence