h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 612
h8s-2649
Manufacturer Part Number
h8s-2649
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2649.pdf
(766 pages)
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Section 21 Power-Down Modes
Rev. 2.00 Dec. 05, 2005 Page 574 of 724
REJ09B0200-0200
Bit
6
5
4
3
2 to 0 —
Bit Name
STS2
STS1
STS0
OPE
Initial
Value
0
0
0
1
All 0
R/W
R/W
R/W
R/W
R/W
—
Description
Standby Timer Select
These bits select the MCU standby time for clock
stabilization when software standby mode, watch mode,
or subactive mode is cancelled by an interrupt or an
instruction to shift to high-speed mode or medium-
speed mode. With a crystal resonator (table 21.3),
select a standby time of 8 ms (oscillation stabilization
time) or more, depending on the operating frequency.
With an external clock, any standby time can be
selected.
000: Standby time = 8192 states
001: Standby time = 16384 states
010: Standby time = 32768 states
011: Standby time = 65536 states
100: Standby time = 131072 states
101: Standby time = 262144 states
110: Reserved
111: Standby time = 16 states
Output Port Enable
Specifies whether the outputs of the address bus and
bus control signals (AS, RD, HWR, LWR) are retained
or set to high-impedance state in software standby
mode or watch mode, or when making a direct
transition.
Reserved
These bits are always read as 0 and cannot be
modified.
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