SH7201 Datasheet, PDF (1036/1196 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 25 Power-Down Modes
(2) Canceling Deep Standby Mode
Deep standby mode is canceled by interrupts (NMI or IRQ) or a reset (manual reset or power-on
reset). However, IRQ is canceled only by PE7 to PE4 and PC25 to PC22. To cancel deep standby
mode by interrupt NMI or IRQ, a power-on reset exception handling instead of an interrupt
exception handling is executed. In the same way, a power-on reset exception handling is executed
by a power-on reset. Figure 25.3 shows the flowchart of canceling deep standby mode.
Deep standby mode
Interrupt detection (NMI, IRQ)
Oscillation settling
time count by DSCNT
Reset detection (MRES, RES)
Keep reset pins (MRES, RES)
low during oscillation settling time
Power-on reset
exception handling routine
DSFR flag check
Power-on reset?
Yes
To power-on reset
exception handling
No
Reconfiguration of
peripheral functions*
Clear IOKEEP bit in DSFR
Back to previous state before deep standby mode
Note: * Peripheral functions include every function such as CPG, INTC, BSC, I/O ports, PFC, and peripheral modules
Figure 25.3 Flowchart of Canceling Deep Standby Mode
Rev. 2.00 Sep. 07, 2007 Page 1008 of 1164
REJ09B0321-0200