Renesas R5S72623 Manual Do Utilizador

 

Section 33   Power-Down Modes 

R01UH0134EJ0400  Rev. 4.00  

 

Page 1813 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

Deep standby mode is canceled by interrupts (NMI or realtime clock alarm interrupt), change on 
the pins for canceling, or a reset (power-on reset). The realtime clock alarm interrupt can always 
cancel deep standby mode regardless of the interrupt priority level or the status register (SR) 
setting in the CPU. When canceling the mode by a source other than a reset, a power-on reset 
exception handling is executed instead of an interrupt exception handling. 

Figure 33.3 shows the flowchart of canceling deep standby mode. 

Detect an interrupt (NMI or realtime clock alarm).

Detect change on the pins for canceling.

Count oscillation settling 

time

No

Yes

Detect 

RES

The 

RES pin is held low  

during oscillation settling 

time

Power-on reset 

exception handling 

according to the boot mode

specified for the reset

To the initialization routine

Power-on reset exception handling

[1-Mbyte version] 

Read PC from H'FFFF8000
Read SP from H'FFFF8004

[640-Kbyte version]

Read PC from H'1C000000
Read SP from H'1C000004

Power-on reset 

exception handling 

according to the boot mode

specified for the reset

Check the flags in DSFR

Processing according to deep

standby mode cancel source

Reconfiguration of 
peripheral functions*

Clear the IOKEEP bit in DSFR 

(Release the pin state retention)

To the state before the transition 

to deep standby mode

Deep standby mode

RAMBOOT=1?

Note:   *  Peripheral functions include all functions such as the clock pulse generator, interrupt controller, 
               bus state controller, general I/O ports, and peripheral modules.