h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 740

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 24 Power-Down State
Bit 7—Software Standby (SSBY): Determines the operating mode, in combination with other
control bits, when a power-down mode transition is made by executing a SLEEP instruction. The
SSBY setting is not changed by a mode transition due to an interrupt, etc.
Bit 7
SSBY
0
1
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the time the MCU
waits for the clock to stabilize when software standby mode, watch mode, or subactive mode is
cleared and a transition is made to high-speed mode or medium-speed mode by means of a
specific interrupt or instruction. With crystal oscillation, refer to table 24.5 and make a selection
according to the operating frequency so that the standby time is at least 8 ms (the oscillation
settling time). With an external clock, any selection can be made.
Bit 6
STS2
0
1
Note:
Bit 3—Reserved: This bit cannot be modified and is always read as 0.
Rev. 4.00 Jun 06, 2006 page 686 of 1004
REJ09B0301-0400
* Do not used this setting in the on-chip flash memory version.
Bit 5
STS1
0
1
0
1
Description
Transition to sleep mode after execution of SLEEP instruction in high-speed mode or
medium-speed mode
Transition to subsleep mode after execution of SLEEP instruction in subactive mode
Transition to software standby mode, subactive mode, or watch mode after execution
of SLEEP instruction in high-speed mode or medium-speed mode
Transition to watch mode or high-speed mode after execution of SLEEP instruction in
subactive mode
Bit 4
STS0
0
1
0
1
0
1
0
1
Description
Standby time = 8192 states
Standby time = 16384 states
Standby time = 32768 states
Standby time = 65536 states
Standby time = 131072 states
Standby time = 262144 states
Reserved
Standby time = 16 states *
(Initial value)
(Initial value)