HD6433713 datasheet(94/324 Pages) RENESAS

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3.4 System Control Registers

Table 3-7 shows how the system control registers (SYSCR1 and SYSCR2) are configured.

These two registers are used to control the power-down modes.

Table 3-7 Register Configuration

Name

Abbreviation

R/W

Initial Value

Address

System control register 1

SYSCR1

R/W

H'00

H'FFF0

System control register 2

SYSCR2

R/W

H'F4

H'FFF1

3.4.1 System Control Register 1 (SYSCR1)

Note: * Write is enabled only in active mode.

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

Bit 7: Standby (SSBY)

This bit designates transition to standby mode.

When standby mode is cleared by an external interrupt and the system goes to active mode, this

bit remains set to 1. It must be cleared by writing a 0. Writing is possible only in active mode.

Bit 7

SSBY

Explanation

When a SLEEP instruction is executed, a transition is made to sleep

(initial value)

mode.

When a SLEEP instruction is executed, a transition is made to standby mode or watch

mode.

Bit

Initial value

Read/Write

SSBY

R/W

STS2

R/W

STS1

R/W

STS0

R/W

LSON

R/W

—

R/W

—

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