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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
Initial Value
H'EE012
System control register
SYSCR
R/W
H'09
H'EE01C
Module standby control register H
MSTCRH
R/W
H'78
H'EE01D
Module standby control register L
MSTCRL
R/W
H'00
Note: * Lower 20 bits of the address in advanced mode.
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
UE
1
R/W
0
RAME
1
R/W
2
NMIEG
0
R/W
1
SSOE
0
R/W
Software standby
Enables transition to
software standby mode
RAM enable
Standby timer select 2 to 0
These bits select the
waiting time of the CPU
and peripheral functions
User bit enable
NMI edge select
Software standby
output port enable
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).
Summary of Contents for H8/3008
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