HD6413008VF25 Datasheet, PDF (505/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

18. Power-Down State
18.2 Register Configuration
The H8/3008 has a system control register (SYSCR) that controls the power-down state, and
module standby control registers H (MSTCRH) and L (MSTCRL) that control the module standby
function. Table 18.2 summarizes these registers.
Table 18.2 Control Register
Address* Name
Abbreviation R/W
H'EE012 System control register
SYSCR
R/W
H'EE01C Module standby control register H MSTCRH
R/W
H'EE01D Module standby control register L MSTCRL
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
H'09
H'78
H'00
18.2.1 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
1
0
UE NMIEG SSOE RAME
1
0
0
1
R/W
R/W
R/W
R/W
RAM enable
Software standby
output port enable
NMI edge select
User bit enable
Standby timer select 2 to 0
These bits select the
waiting time of the CPU
and peripheral functions
Software standby
Enables transition to
software standby mode
SYSCR is an 8-bit readable/writable register. Bit 7 (SSBY), bits 6 to 4 (STS2 to STS0), and bit 1
(SSOE) control the power-down state. For information on the other SYSCR bits, see section 3.3,
System Control Register (SYSCR).
Rev.4.00 Aug. 20, 2007 Page 459 of 638
REJ09B0395-0400