HD6432351 datasheet(730/1025 Pages) RENESAS

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Section 20 Power-Down Modes

Rev. 3.00 Sep 15, 2006 page 696 of 988

REJ09B0330-0300

20.6.3

Setting Oscillation Stabilization Time after Clearing Software Standby Mode

Bits STS2 to STS0 in SBYCR should be set as described below.

Using a Crystal Oscillator

Set bits STS2 to STS0 so that the standby time is at least 8 ms (the oscillation stabilization time).

Table 20.4 shows the standby times for different operating frequencies and settings of bits STS2 to

STS0.

Table 20.4 Oscillation Stabilization Time Settings

STS2 STS1 STS0 Standby Time

MHz

MHz Unit

8192 states

0.41 0.51 0.68 0.8

1.0

1.3

2.0

4.1

16384 states

0.82 1.0

1.3

1.6

2.0

2.7

4.1

8.2

32768 states

1.6

2.0

2.7

3.3

4.1

5.5

8.2 16.4

65536 states

3.3

4.1

5.5

6.6

8.2

10.9 16.4 32.8

131072 states

6.6

8.2

10.9 13.1 16.4 21.8 32.8 65.5

262144 states

13.1 16.4 21.8 26.2 32.8 43.6 65.6 131.2

Reserved

—

16 states

0.8

1.0

1.3

1.6

2.0

2.7

4.0

8.0

µs

: Recommended time setting

Using an External Clock

Any value can be set. Normally, use of the minimum time is recommended.

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