HD64F3039F18 Datasheet, PDF (533/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 17 Power-Down State
17.2 Register Configuration
This LSI has a system control register (SYSCR) that controls the power-down state, and a module
standby control register (MSTCR) that controls the module standby function. Table 17.2
summarizes this register.
Table 17.2 Register Configuration
Address*
Name
H'FFF2
System control register
H'FF5E
Module standby control
register
Note: * Lower 16 bits of the address.
Abbreviation
R/W
SYSCR
R/W
MSTCR
R/W
Initial Value
H'0B
H'40
17.2.1 System Control Register (SYSCR)
Bit
Initial value
Read/Write
7
SSBY
0
R/W
6
STS2
0
R/W
5
STS1
0
R/W
4
STS0
0
R/W
3
2
UE NMIEG
1
0
R/W R/W
1
0
— RAME
1
1
—
R/W
RAM enable
Reserved bit
NMI edge select
User bit enable
Standby timer select 2 to 0
These bits select the
waiting time at exit from
software standby mode
Software standby
Enables transition to
software standby mode
SYSCR is an 8-bit readable/writable register. Bit 7 (SSBY) and bits 6 to 4 (STS2 to STS0) control
the power-down state. For information on the other SYSCR bits, see section 3.3, System Control
Register (SYSCR).
Rev.3.00 Mar. 26, 2007 Page 509 of 682
REJ09B0353-0300