H8SSLASH2224 datasheet(879/1071 Pages) RENESAS

879 / 1071 page

Section 24 Power-Down Modes

Rev. 5.00 Aug 08, 2006 page 793 of 982

REJ09B0054-0500

than interrupts IRQ7 to IRQ0 is generated. Software standby mode cannot be cleared if the

interrupt has been masked on the CPU side or has been designated as a DTC activation source.

• Clearing with the RES Pin or MRES Pin

When the

RES pin or MRES pin is driven low, clock oscillation is started. At the same time as

clock oscillation starts, clocks are supplied to the entire this LSI chip. Note that the

RES pin or

MRES pin must be held low until clock oscillation settles. When the RES pin or MRES pin

goes high, the CPU begins reset exception handling.

• Clearing with the STBY Pin

When the

STBY pin is driven low, a transition is made to hardware standby mode.

24.4.3

Oscillation Settling 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 tOSC2 ms (the oscillation settling

time). Table 24.3 shows the standby times for different operating frequencies and settings of

bits STS2 to STS0.

• Using an External Clock

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

Note: Do not set 16 states for standby time in the F-ZTAT version. 8192 states or more should

be set.

Table 24.3 Oscillation Settling Time Settings

STS2 STS1 STS0 Standby Time

MHz*

MHz

MHz*

Unit

8192 states

0.41

0.51

0.6

0.8

1.0

1.4

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

2.5

3.3

4.1

5.5

8.2

16.4

65536 states

3.3

4.1

5.0

6.6

8.2

10.9

16.4

32.8

131072 states 6.6

8.2

10.1

13.1

16.4

21.8

32.8

65.5

262144 states 13.1

16.4

20.2

26.2

32.8

43.7

65.5

131.1

Reserved



16 states

0.8

1.0

1.2

1.6

2.0

2.7

4.0

8.0

µs

: Recommended time setting

Notes: 1. Supported only by the H8S/2239 Group.

2. The H8S/2258 Group is out of operation.

H8S/2224 Scheda tecnica(PDF) 879 Page - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 879 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL