SH7730 Datasheet, PDF (1105/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 33 Electrical Characteristics
The time over which the internal state is undefined means the time taken to reach Vcc (min.).
The pin states become defined when V_CCQ, AV_CC, (min.) are reached. The period of power-on reset
(RESETP) is, however, normally accepted as meaning the time taken for oscillation to become
stable (when using the on-chip oscillator) after Vcc (min.) is reached.
Ensure that the period over which the internal state is undefined is less than or equal to 100 ms.
(2) Power-off order
• In the reverse order of powering-on, first turn off the 1.2 V power, then turn off the
3.3 V power within 10 ms. This interval 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.
• Do not allow the voltage of the 1.2 V supply system to be above that of the 3.3 V supply
system.
• Pin states are undefined while only the 1.5 V power is off. The system design must ensure that
these undefined states do not cause erroneous system operation.
VccQ, AVcc: 3.3 V power
Vcc, Vcc_PLL1, Vcc_PLL2: 1.2 V power
GND
V_CC/2 level voltage
Normal operation period
t_PWD
Operation stopped
Table 33.3 Recommended Timing in Power-Off
Item
Symbol Maximum Value Unit
Time difference between the power-off of (V_CCQ, AV_CC) t_PWD
10
ms
and (V , V _PLL1, V _PLL2) levels
CC CC
CC
Note: * The table shown above is recommended values, so they represent guidelines rather
than strict requirements.
Rev. 1.00 Sep. 19, 2007 Page 1057 of 1136
REJ09B0359-0100