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20
CHAPTER 2 HANDLING DEVICES
Figure 2.1-1 Operation Sequences after Power-on Reset between Product Types
As shown in Figure 2.1-1 , the start of CPU operation of a product with a step-down circuit is slower than
that of the product without a step-down circuit. This is because time is required for the step-down circuit to
stabilize prior to normal operation of the step-down circuit.
Oscillation stabilization
wait time (2
18
/F
CH
)
Power supply (V
CC
)
Step-down circuit stabilization time (2
17
/F
CH
) +
Oscillation stabilization wait time (2
18
/F
CH
)
CPU operation of
product with a step-down
circuit (MB89F202/F202RA)
CPU operation of
product without a
step-down circuit
(MB89202 and MB89V201)
Start of CPU operation of
product without a step-down
circuit (reset vector)
Start of the CPU operation of
product with a step-down
circuit (reset vector)
F
CH
: Main oscillation frequency