HD64F36034 datasheet(116/592 Pages) RENESAS

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Section 6 Power-Down Modes

Rev. 4.00 Mar. 15, 2006 Page 84 of 556

REJ09B0026-0400

Function

Active Mode

Sleep Mode

Subactive

Mode

Subsleep

Mode

Standby Mode

Timer V

Functioning

Reset

Watchdog

timer

Functioning

Retained (functioning if the internal oscillator are

selected as a count clock*)

Peripheral

functions

SCI3, SCI3_2*

Functioning

Reset

TinyCAN

Functioning

Retained

SSU

Functioning

Retained

Subtimer

Functioning

Retained

(functioning if

the on-chip

oscillator is

enabled)

Timer B1

Functioning

Retained*

Retained

Timer Z

Functioning

Retained (When internal clock

φ is selected as a

count clock, the counter counts up with sub

clock*.)

A/D converter

Functioning

Reset

Note:

Registers can be read from or written to in subactive mode.

6.2.1

Sleep Mode

In sleep mode, CPU operation is halted but the on-chip peripheral modules function at the clock

frequency set by the MA2, MA1, and MA0 bits in SYSCR2. CPU register contents are retained.

When an interrupt is requested, sleep mode is cleared and interrupt exception handling starts.

Sleep mode is not cleared if the I bit of the condition code register (CCR) is set to 1 or the

requested interrupt is disabled in the interrupt enable register. After sleep mode is cleared, a

transition is made to active mode when the LSON bit in SYSCR2 is 0, and a transition is made to

subactive mode when the bit is 1.

When the

RES pin goes low, the CPU goes into the reset state and sleep mode is cleared.

6.2.2

Standby Mode

In standby mode, the clock pulse generator stops, so the CPU and on-chip peripheral modules stop

functioning. However, as long as the rated voltage is supplied, the contents of CPU registers, on-

chip RAM, and some on-chip peripheral module registers are retained. On-chip RAM contents

will be retained as long as the voltage set by the RAM data retention voltage is provided. The I/O

ports go to the high-impedance state.

HD64F36034 Datasheet(PDF) 116 Page - Renesas Technology Corp

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