HD6432142 datasheet(802/1177 Pages) RENESAS

802 / 1177 page

Section 25 Power-Down State

Rev. 4.00 Sep 27, 2006 page 758 of 1130

REJ09B0327-0400

Using a Crystal Oscillator

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

Table 25.5 shows the standby times for different operating frequencies and settings of bits STS2 to

STS0.

Table 25.5

Oscillation Settling Time Settings

STS2 STS1 STS0 Standby Time

MHz

Unit

8192 states

0.41

0.51

0.65

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

———

——

µs

16 states*

0.8

1.0

1.3

1.6

2.0

2.7

4.0

8.0

: Recommended time setting

Note:

This setting must not be used in the flash memory version.

Using an External Clock

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

25.6.4

Software Standby Mode Application Example

Figure 25.3 shows an example in which a transition is made to software standby mode at the

falling edge on the NMI pin, and software standby mode is cleared at the rising edge on the NMI

pin.

In this example, an NMI interrupt is accepted with the NMIEG bit in SYSCR cleared to 0 (falling

edge specification), then the NMIEG bit is set to 1 (rising edge specification), the SSBY bit is set

to 1, and a SLEEP instruction is executed, causing a transition to software standby mode.

Software standby mode is then cleared at the rising edge on the NMI pin.

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