SH7021 datasheet(65/509 Pages) RENESAS

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44 RENESAS

Software Standby Mode: To enter the standby mode, set the standby bit SBY (in the standby

control register SBYCR) to 1 and execute a SLEEP instruction. In standby mode, all CPU, on-chip

peripheral module and oscillator functions are halted. CPU internal register contents and on-chip

RAM data are held.

To return from standby mode, use a reset or an external NMI interrupt. For resets, the CPU returns

to ordinary program execution state through the exception processing state when placed in a reset

state during 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 2.19

Power-Down State

State

Mode

Conditions

Clock CPU

On-chip

Peripheral

Modules

CPU

Regi-

sters

RAM I/O Ports

Canceling

Sleep

mode

Execute SLEEP

instruction with

SBY bit cleared

to 0 in SBYCR

Run

Halt Run

Held

1. Interrupt

2. DMA address

error

3. Power-on

reset

4. Manual reset

Stand

mode

Execute SLEEP

instruction with

SBY bit set to 1

in SBYCR

Halt

Halt Halt and

initialize*

Held

Held or

high-Z*

(selectable)

1. NMI

2. Power-on

reset

3. Manual reset

Note:

Differs depending on the peripheral module and pin.

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