Section 18 Power-Down Mode
Rev. 1.00 Oct. 01, 2007 Page 679 of 1956
REJ09B0256-0100
18.5
Software Standby Mode
18.5.1 Transition
to
Software Standby Mode
Executing the SLEEP instruction when the STBY bit in STBCR is 1 causes a transition from the
program execution state to software standby mode. In software standby mode, not only the CPU
but also the clock and on-chip peripheral modules halt. However, the clock output from the
CLKOUT pin continues when the CKONE bit in the PLLCR register of the CPG is set to 1. When
the CKONE bit is 0, a low level is output from the CLKOUT pin.
The contents of the CPU and cache registers remain unchanged. Some registers of the on-chip
peripheral modules are initialized.
The procedure for a transition to software standby mode is as follows:
1. Set the STBY bit in STBCR to 1.
2. Execute the SLEEP instruction.
3. Software standby mode is entered and the clocks within the LSI are halted. The output on the
STATUS0 pin goes high.
All modules should be stopped before the above procedure is executed.
18.5.2 Canceling
Software Standby Mode
Software standby mode is canceled by an interrupt (NMI or IRQ/IRL) or a reset.
(1) Canceling
with
Interrupt
When an NMI or IRQ, occurs, software standby mode is canceled and the STATUS0 pin goes
low. Thereafter, interrupt exception handling is executed and a code indicating the interrupt source
is set in INTEVT. After branching to the interrupt service routine, clear the STBY bit in the
STBCR register back to 0. Since interrupts are accepted in software standby mode even when the
BL bit in SR is 1, save SPC and SSR to the stack before executing the SLEEP instruction if
necessary.
Immediately after an interrupt is detected, the clock output on the CLKOUT pin may be unstable
until software standby mode is canceled.
Содержание SH7763
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Страница 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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