HD64F2357F20V Datasheet, PDF (699/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

21.2 Register Descriptions
21.2.1 Standby Control Register (SBYCR)
Bit
:
7
6
5
4
3
2
SSBY STS2 STS1 STS0 OPE
—
Initial value :
0
0
0
0
1
0
R/W
: R/W
R/W
R/W
R/W
R/W
—
1
0
—
—
0
0
—
R/W
SBYCR is an 8-bit readable/writable register that performs software standby mode control.
SBYCR is initialized to H'08 by a reset and in hardware standby mode. It is not initialized in software standby mode.
Bit 7—Software Standby (SSBY): Specifies a transition to software standby mode. Remains set to 1 when software
standby mode is released by an external interrupt, and a transition is made to normal operation. The SSBY bit should be
cleared by writing 0 to it.
Bit 7
SSBY
0
1
Description
Transition to sleep mode after execution of SLEEP instruction
(Initial value)
Transition to software standby mode after execution of SLEEP instruction
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 is cleared by an external interrupt. With crystal oscillation, refer to table 21-4 and
make a selection according to the operating frequency so that the standby time is at least 8 ms (the oscillation stabilization
time). With an external clock, any selection can be made*.
Note: * Not available in the F-ZTAT version.
Bit 6 Bit 5 Bit 4
STS2 STS1 STS0 Description
0
0
0
Standby time = 8,192 states
1
Standby time = 16,384 states
1
0
Standby time = 32,768 states
1
Standby time = 65,536 states
1
0
0
Standby time = 131,072 states
1
Standby time = 262,144 states
1
0
Reserved
1
Standby time = 16 states*
Note: * Not available in the F-ZTAT version.
(Initial value)
Rev.6.00 Oct.28.2004 page 669 of 1016
REJ09B0138-0600H