SH7618 Datasheet, PDF (573/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 21 Electrical Characteristics
The time over which the internal state is undefined means the time taken to reach V_CC (min.).
The pin states become settled when V_CCQ reached the V_CCQ (min.). The timing when a power-on
reset (RES) is normally accepted is after V_CC reaches V_CC (min.) and oscillation becomes stable
(when using the on-chip oscillator).
Ensure that the time over which the internal state is undefined is less than or equal to 100 ms.
• Power-off order
 In the reverse order of power-on, first turn off the 1.5-V system power, then turn off the
3.3-V system power within 10 ms. This time should be as short as possible. The system
design must ensure that the states of pins or undefined period of an internal state do not
cause erroneous system operation.
 Pin states are undefined while only the 1.5-V system power is turned off. The system
design must ensure that these undefined states do not cause erroneous system operation.
V_ccQ : 3.3-V system power
V_cc : 1.5-V system power
GND
V_cc/2
Normal operation period
t_PWD
Operation stopped
Table 21.3 Recommended Timing in Power-Off
Item
Symbol Maximum Value Unit
Time difference between turning off V_CCQ and V_CC
t_PWD
10
ms
Note: * The table shown above is recommended values, so they represent guidelines rather
than strict requirements.
Rev. 6.00 Jun. 12, 2007 Page 541 of 610
REJ09B0131-0600