Renesas SH7641 - Manual (Page 958)

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