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Bit 7—Software Standby (SSBY): Enables transition to software standby mode. When software
standby mode is exited by an external interrupt, this bit remains set to 1 after the return to normal
operation. 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
Bits 6 to 4—Standby Timer Select (STS2 to STS0): These bits select the length of time the CPU
and on-chip supporting modules wait for the clock to settle when software standby mode is exited
by an external interrupt. If the clock is generated by a crystal resonator, set these bits according to
the clock frequency so that the waiting time will be at least 7 ms. See table 18.3. If an external
clock is used, any setting can be selected.
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0
Description
0
0
0
Waiting time = 8,192 states
(Initial value)
1
Waiting time = 16,384 states
1
0
Waiting time = 32,768 states
1
Waiting time = 65,536 states
1
0
0
Waiting time = 131,072 states
1
0
1
Waiting time = 262,144 states
1
1
0
Waiting time = 1,024 states
1
1
1
Illegal setting
Bit 1—Software Standby Output Port Enable (SSOE): Specifies whether the address bus and
bus control signals (
CS
0
to
CS
7
,
AS
,
RD
,
HWR
, and
LWR
) are kept as outputs or fixed high, or
placed in the high-impedance state in software standby mode.
Bit 1
SSOE
Description
0
In software standby mode, the address bus and bus control signals
are all high-impedance
(Initial value)
1
In software standby mode, the address bus retains its output state and
bus control signals are fixed high
Summary of Contents for H8/3008
Page 1: ...Hitachi 16 Bit Microcomputer H8 3008 Hardware Manual ADE 602 221 Rev 1 0 9 14 00 Hitachi Ltd ...
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