HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 583
HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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Standby mode is canceled by an interrupt (NMI, IRQ*
or a reset.
Canceling with an Interrupt: The on-chip WDT can be used for hot starts. When the chip detects
an NMI, IRL*
clock will be supplied to the entire chip and software standby mode canceled after the time set in
the WDT's timer control/status register has elapsed. The STATUS1 and STATUS0 pins both go
low. Interrupt processing then begins and a code indicating the interrupt source is set in the
INTEVT and INTEVT2 registers. After branching to the interrupt processing routine occurs, clear
the STBY bit in the STBCR register. The WTCNT stops automatically. If the STBY bit is not
cleared, WTCNT continues operation and transits to the standby mode*
This function prevents the data from being destroyed due to a rising voltage under an unstable
power supply. Interrupts are accepted during software standby mode even when the BL bit in the
SR register is 1. If necessary, save SPC and SSR in the stack before executing the SLEEP
instruction. Immediately after an interrupt is detected, the phase of the clock output of the CKIO
pin may be unstable, until the processor starts interrupt processing. (The canceling condition is
that the IRL3 to IRL0 level is higher than the mask level in the I3 to I0 bits in the SR register.)
Notes: 1. Software Standby mode can be canceled using IRL3 to IRL0 or IRQ4 to IRQ0.
Canceling Software Standby Mode
2. Software standby mode can be canceled with an RTC or TMU (only when running on
3. Standby mode should be canceled by power-on resets. Operations at manual resets or
the RTC clock) interrupt.
during interrupt input are not guaranted.
WTCNT value
H'FF
H'80
Figure 22.1 Canceling Software Standby Mode with STBCR.STBY
1
, IRQ*
1
, or on-chip supporting module (except the interval timer)*
Interrupt
request
Crystal oscillator settling
time and PLL synchronization
time
1
, IRL*
WDT overflow and branch to
interrupt handling routine
Clear bit STBCR.STBY before
WTCNT reaches H'80. When
STBCR.STBY is cleared, WTCNT
halts automatically.
1
, or on-chip supporting module)*
Rev. 4.00, 03/04, page 537 of 660
3
when it reaches H'80.
Time
2
interrupt, the
2
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