HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 504

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

18. Power-Down State
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
0
1
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. Set these bits
according to the operating frequency so that the waiting time will be at least 100 μs.
Bit 6
STS2
0
1
1
1
1
Bit 1—Software Standby Output Port Enable (SSOE): Specifies whether the address bus and
bus control signals (CS
placed in the high-impedance state in software standby mode.
Bit 1
SSOE
0
1
Rev.4.00 Aug. 20, 2007 Page 460 of 638
REJ09B0395-0400
Bit 5
STS1
0
1
0
0
1
1
Description
SLEEP instruction causes transition to sleep mode
SLEEP instruction causes transition to software standby mode
Description
In software standby mode, the address bus and bus control signals
are all high-impedance
In software standby mode, the address bus retains its output state and bus control
signals are fixed high
Bit 4
STS0
0
1
0
1
0
1
0
1
0
to CS
7
, AS, RD, HWR, and LWR) are kept as outputs or fixed high, or
Description
Waiting time = 8,192 states
Waiting time = 16,384 states
Waiting time = 32,768 states
Waiting time = 65,536 states
Waiting time = 131,072 states
Waiting time = 262,144 states
Waiting time = 1,024 states
Illegal setting
(Initial value)
(Initial value)
(Initial value)