SH7263 Datasheet, PDF (1619/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 32 Power-Down Modes
(2) Canceling Deep Standby Mode
Deep standby mode is canceled by interrupts (NMI or an IRQ assigned to PE11 to PE4) or a reset
(manual reset or power-on reset). When canceling the mode by the interrupt NMI or IRQ, a
power-on reset exception handling is executed instead of an interrupt exception handling. When
canceling the mode by manual reset, the same handling is executed.
Figure 32.3 shows the flowchart of canceling deep standby mode.
Detect an interrupt
(NMI or IRQ)
Count oscillation settling
time
Deep standby mode
Detect MRES
The MRES pin is held low
during oscillation settling
time
No
RAMBOOT = 1
Yes
Power-on reset
exception handling
Read PC from H'FFFF8000
Read SP from H'FFFF8004
Power-on reset
exception handling
Read PC from H'00000000
Read SP from H'00000004
Detect RES
The RES pin is held low
during oscillation settling
time
Power-on reset
exception handling
Read PC from H'00000000
Read SP from H'00000004
To the initialization routine
Check the flags in DSFR
Exception handling 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
Note: * Peripheral functions include all functions such as CPG, INTC, BSC, I/O ports, PFC and peripheral
modules.
Figure 32.3 Flowchart of Canceling Deep Standby Mode
Rev. 2.00 Mar. 14, 2008 Page 1585 of 1824
REJ09B0290-0200