H8SLASH3028 datasheet(88/923 Pages) RENESAS

88 / 923 page

Rev. 2.00, 09/03, page 58 of 890

3.3

System Control Register (SYSCR)

SYSCR is an 8-bit register that controls the operation of the H8/3028 Group.

Bit

Initial value

Read/Write

SSBY

R/W

STS2

R/W

STS1

R/W

STS0

R/W

RAME

R/W

NMIEG

R/W

SSOE

R/W

Software standby

Enables transition to software standby mode

User bit enable

Selects whether to use the UI bit in CCR

as a user bit or an interrupt mask bit

NMI edge select

Selects the valid edge

of the NMI input

RAM enable

Enables or

disables

on-chip RAM

Standby timer select 2 to 0

These bits select the waiting time at

recovery from software standby mode

Software standby output

port enable

Selects the output state

of the address bus

and bus control signals

in software standby mode

Bit 7—Software Standby (SSBY): Enables transition to software standby mode. (For further

information about software standby mode see section 20, Power-Down State.)

When software standby mode is exited by an external interrupt, this bit remains set to 1. To clear

this bit, write 0.

Bit 7

SSBY

Description

SLEEP instruction causes transition to sleep mode

(Initial value)

SLEEP instruction causes transition to software standby mode

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