SH7014 Datasheet, PDF (83/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

2. CPU
To return from standby mode, use a power-on reset or an NMI interrupt. For resets, the CPU
returns to ordinary program execution state through the exception processing state when placed in
a reset state for the duration of the oscillator stabilization time. For NMI interrupts, the CPU
returns to ordinary program execution state through the exception processing state after the
oscillator stabilization time has elapsed. In this mode, power consumption drops markedly, since
the oscillator stops (table 2.18).
Table 2.18 Power-Down State
State
Mode
Transition
Conditions
On-Chip
Peripheral CPU
Clock CPU Modules Registers
On-Chip
Cache or I/O
On-Chip Port
RAM
Pins
Canceling
Sleep
Execute Run
SLEEP
instruction
with SBY bit
cleared to 0
in SBYCR
Halt Run
Held
Held
Held
• Interrupt
• DMA address
error
• Power-on reset
Stand- Execute Halt
by SLEEP
instruction
with SBY bit
set to 1 in
SBYCR
Halt Halt and
initialize*
Held
Held
Held or •
Hi-Z _•
(select-
able)
NMI interrupt
Power-on reset
Note: * Differs depending on the peripheral module and pin.
Rev.5.00 Sep. 27, 2007 Page 49 of 716
REJ09B0398-0500