SH7641 Datasheet, PDF (958/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

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