r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1684

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Appendix
D.2
The power-on and power-off sequences for the 1.0 V power supply (VDD10 using pins VDD,
VDD-PLL1, VDDA-PLL1, and VDD-PLL2), 1.8 V power supply (VDD18 using pin VDD-DDR),
and 3.3 V power supply (VDD33 using pins VDDQ, VDDQ-PLL1, VDDQ-PLL2, and VDDQ-
TD*) in DDR2-SDRAM power supply backup mode are as follows.
Note: * If VDDQ-TD is connected to VDDQ.
• Power-On Sequence
• Power-Off Sequence
Rev.1.00 Jan. 10, 2008 Page 1654 of 1658
REJ09B0261-0100
There is no restriction on the sequence in which the above power supplies are powered on.
Ensure that all the power supplies start within 300 ms of the start of a power supply other than
VDD-DDR.
There is no restriction on the sequence in which the above power supplies are powered off.
Ensure that all the power supplies stop within 300 ms of the stop of a power supply other than
VDD-DDR.
Figure D.2 Power-On and Power-Off Sequences for Power Supplies with Different
Power-On and Power-Off Sequences for Power Supplies with Different Potentials in
DDR2-SDRAM Power Supply Backup Mode
0.1 × V**
0.9 × V**
Potentials in DDR2-SDRAM Power Supply Backup Mode
300ms > t ≥ 0s
300ms > t ≥ 0s
V** min
0.2 [V]
VDD18 = ON
VDD10 (pins: VDD, VDD-PLL1, VDDA-PLL1, VDD-PLL2)
VDD33 (pins: VDDQ, VDDQ-PLL1, VDDQ-PLL2, VDDQ-TD*)
Note: * If VDDQ-TD is connected to VDDQ.
V**: VDD10, VDD18, VDD33
VDD18 = ON
V**: VDD10,VDD33