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20.2
Register Configuration
The H8/3067 Group 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 20.2 summarizes these registers.
Table 20.2 Control Register
Address*
Name
H'EE012
System control register
H'EE01C
Module standby control register H
H'EE01D
Module standby control register L
Note: * Lower 20 bits of the address in advanced mode.
20.2.1
System Control Register (SYSCR)
Bit
SSBY
Initial value
Read/Write
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).
7
6
5
STS2
STS1
0
0
0
R/W
R/W
R/W
Standby timer select 2 to 0
These bits select the
waiting time of the CPU
and peripheral functions
Section 20 Power-Down State
Abbreviation
SYSCR
MSTCRH
MSTCRL
4
3
2
STS0
UE
NMIEG
0
1
0
R/W
R/W
R/W
NMI edge select
User bit enable
Rev. 4.00 Jan 26, 2006 page 677 of 938
R/W
Initial Value
R/W
H'09
R/W
H'78
R/W
H'00
1
0
SSOE
RAME
0
1
R/W
R/W
RAM enable
Software standby
output port enable
REJ09B0276-0400
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