HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 572
HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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21.2
• Order of turning on 1.5-V system power (V
Table 21.2 Recommended Timing at Power-On
Note:
Rev. 6.00 Jun. 12, 2007 Page 540 of 610
REJ09B0131-0600
Item
Time difference between turning on V
Time over which the internal state is undefined
Section 21 Electrical Characteristics
and 3.3-V system power (V
First turn on the 3.3-V system power, then turn on the 1.5-V system power within 1 ms.
Until voltage is applied to all power supplies and a low level is input to the RES pin,
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.
internal circuits remain unsettled, and so pin states are also undefined. The system design
must ensure that these undefined states do not cause erroneous system operation.
Waveforms at power-on are shown in the following figure.
*
Power-On and Power-Off Order
The values shown in table 21.2 are recommended values, so they represent guidelines
rather than strict requirements.
Other pins *
Note: * Except power/GND and clock related pins
GND
RES
Input low level in advance
CC
Pin states undefined
Q)
Pin states undefined
CC
t
Q and V
PWU
t
UNC
CC
CC
V
(main), V
cc
Q (min.) power
V
V
Power-on reset state
cc
cc
/2
Symbol
t
t
CC
PWU
UNC
(min.)
(sub), V
Normal operation period
V
V
cc
cc
Q : 3.3-V system power
: 1.5-V system power
CC
Maximum Value
1
100
(PLL1), and V
CC
(PLL2))
Unit
ms
ms
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