
Section 5 Power-Down Modes
Rev. 6.00 Sep 12, 2006 page 96 of 526
REJ09B0326-0600
5.3.3
Oscillator Settling Time after Standby Mode Is Cleared
Bits STS2 to STS0 in SYSCR1 should be set as follows.
•
When a crystal oscillator is used
The table 5.4 gives settings for various operating frequencies. Set bits STS2 to STS0 for a
waiting time of at least 10 ms.
Table 5.4
Clock Frequency and Settling Time (times are in ms)
STS2
STS1
STS0
Waiting Time
5 MHz
4 MHz
2 MHz
1 MHz
0.5 MHz
0
0
0
8,192
states
1.6 2.0 4.1 8.2 16.4
0
0
1
16,384
states 3.2
4.1
8.2
16.4
32.8
0
1
0
32,768
states 6.6
8.2
16.4 32.8
65.5
0
1
1
65,536
states 13.1 16.4 32.8 65.5
131.1
1
* *
131,072
states 26.2 32.8 65.5 131.1
262.1
Legend:
*
Don’t care
•
When an external clock is used
Any values may be set. Normally the minimum time (STS2 = STS1 = STS0 = 0) should be set.
5.4 Watch
Mode
5.4.1
Transition to Watch Mode
The system goes from active or subactive mode to watch mode when a SLEEP instruction is
executed while the SSBY bit in SYSCR1 is set to 1 and bit TMA3 in TMA is set to 1.
In watch mode, operation of on-chip peripheral modules other than timer A is halted. As long as a
minimum required voltage is applied, the contents of CPU registers, the on-chip RAM and some
registers of the on-chip peripheral modules, are retained. I/O ports keep the same states as before
the transition.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...