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MDS0 are read-only bits. The mode pin (MD
2
to MD
0
) levels are latched into these bits when
MDCR is read.
3.3
System Control Register (SYSCR)
SYSCR is an 8-bit register that controls the operation of the H8/3008.
Bit
Initial value
Read/Write
7
SSBY
0
R/W
6
STS2
0
R/W
5
STS1
0
R/W
4
STS0
0
R/W
3
UE
1
R/W
0
RAME
1
R/W
2
NMIEG
0
R/W
1
SSOE
0
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
Selects the output state
of the address bus and
bus control signals in
software standby mode
Software standby
output port enable
Bit 7—Software Standby (SSBY): Enables transition to software standby mode. (For further
information about software standby mode see section 18, Power-Down State.)
When software standby mode is exited by an external interrupt, and a transition is made to normal
operation, this bit remains set to 1. To clear this bit, write 0.
Bit 7
SSBY
Description
0
SLEEP instruction causes transition to sleep mode
(Initial value)
1
SLEEP instruction causes transition to software standby mode
Summary of Contents for H8/3008
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