SH7708 datasheet(161/633 Pages) RENESAS

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8.1.3

Pin Configuration

Table 8.3 lists the pins used for the power-down modes.

Table 8.3

Pin Configuration

Processing

Status 1 Pin (STATUS1)

Processing

Status 0 Pin (STATUS0)

I/O

Processor

Operating Status

High

Reset

Low

Sleep mode

Low

High

Standby mode

Low

Normal operation

Note:

The “normal operation” status applies during refresh cycles even in sleep mode.

8.2

8.2.1

Standby Control Register (STBCR)

The standby control register (STBCR) is an 8-bit read/write register that sets the power-down

mode. STBCR is initialized to H'00 by a power-on reset. Always set bits 6–3 to 0 when writing to

the STBCR register.

Bit:

Bit name:

STBY

—

MSTP2

MSTP1

MSTP0

Initial value:

R/W:

R/W

Bit 7—Standby (STBY): Specifies transition to standby mode.

Bit 7: STBY

Description

Executing SLEEP instruction puts the chip into sleep mode.

(Initial value)

Executing SLEEP instruction puts the chip into standby mode.

Bits 6 to 3—Reserved: These bits always read 0. The write value should always as 0.

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