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Section 5 Power-Down Modes
Rev. 6.00 Sep 12, 2006 page 95 of 526
REJ09B0326-0600
•
Clearing by
RES
input
When the
RES
pin goes low, the CPU goes into the reset state and sleep mode is cleared.
5.2.3
Clock Frequency in Sleep (Medium-Speed) Mode
Operation in sleep (medium-speed) mode is clocked at the frequency designated by the MA1 and
MA0 bits in SYSCR1.
5.3 Standby
Mode
5.3.1
Transition to Standby Mode
The system goes from active mode to standby mode when a SLEEP instruction is executed while
the SSBY bit in SYSCR1 is set to 1, the LSON bit in SYSCR1 is cleared to 0, and bit TMA3 in
TMA is cleared to 0. In standby mode the clock pulse generator stops, so the CPU and on-chip
peripheral modules stop functioning, but as long as the rated voltage is supplied, the contents of
CPU registers, on-chip RAM, and some on-chip peripheral module registers are retained. On-chip
RAM contents will be further retained down to a minimum RAM data retention voltage. The I/O
ports go to the high-impedance state.
5.3.2
Clearing Standby Mode
Standby mode is cleared by an interrupt (IRQ
1
or IRQ
0
) or by input at the
RES
pin.
•
Clearing by interrupt
When an interrupt is requested, the system clock pulse generator starts. After the time set in
bits STS2–STS0 in SYSCR1 has elapsed, a stable system clock signal is supplied to the entire
chip, standby mode is cleared, and interrupt exception handling starts. Operation resumes in
active (high-speed) mode if MSON = 0 in SYSCR2, or active (medium-speed) mode if MSON
= 1. Standby mode is not cleared if the I bit of CCR is set to 1 or the particular interrupt is
disabled in the interrupt enable register.
•
Clearing by
RES
input
When the
RES
pin goes low, the system clock pulse generator starts. After the pulse generator
output has stabilized, if the
RES
pin is driven high, the CPU starts reset exception handling.
Since system clock signals are supplied to the entire chip as soon as the system clock pulse
generator starts functioning, the
RES
pin should be kept at the low level until the pulse
generator output stabilizes.
Содержание F-ZTAT H8/3642A Series
Страница 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Страница 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
Страница 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...