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Section 25 Electrical Characteristics
25.1.1
Power-On Sequence
Supply the power so that VccQ (3.3-V system) and Vcc (1.8-V system) are supplied
simultaneously or Vcc is supplied after VccQ is supplied.
Recommended values for the power-on procedure are shown below.
t
pwu
GND
Unsettling opration
The time at which VccQ
reaches V
Q (min.)
CC
Rev. 4.00 Sep. 14, 2005 Page 908 of 982
REJ09B0023-0400
V
Q: 3.3 V-system power supply
CC
V
Q (min.) voltage
CC
V
: 1.8 V-system power supply
CC
V
CC
V
/2 level voltage
CC
t
unc
Clock starts oscillation
Oscillation settling time (10 ms)
Power-on reset released and then
normal operation started
The time at which Vcc
reaches V
(min.)
CC
Figure 25.1 Power-On Sequence
(min.) voltage
Normal operation
t
pwd
Operation stopped
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