HD6433644R datasheet(110/549 Pages) RENESAS

110 / 549 page

Section 5 Power-Down Modes

Rev. 6.00 Sep 12, 2006 page 90 of 526

REJ09B0326-0600

5.1.1

System Control Registers

The operation mode is selected using the system control registers described in table 5.3.

Table 5.3

System Control Registers

Name

Abbreviation

R/W

Initial Value

Address

System control register 1

SYSCR1

R/W

H'07

H'FFF0

System control register 2

SYSCR2

R/W

H'E0

H'FFF1

System Control Register 1 (SYSCR1)

Bit

SSBY

STS2

STS1

STS0

LSON



MA1

MA0

Initial value

Read/Write

R/W



R/W

SYSCR1 is an 8-bit read/write register for control of the power-down modes.

Upon reset, SYSCR1 is initialized to H'07.

Bit 7



Software Standby (SSBY): This bit designates transition to standby mode or watch mode.

Bit 7: SSBY

Description

• When a SLEEP instruction is executed in active mode, a transition is made

to sleep mode

• When a SLEEP instruction is executed in subactive mode, a transition is

made to subsleep mode

(initial value)

• When a SLEEP instruction is executed in active mode, a transition is made

to standby mode or watch mode

• When a SLEEP instruction is executed in subactive mode, a transition is

made to watch mode

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