Register Configuration; System Control Register (Syscr) - Hitachi H8/3006 Hardware Manual

19.2

Register Configuration

The H8/3006 and H8/3007 have 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 19.2 summarizes these registers.
Table 19.2 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.
19.2.1

System Control Register (SYSCR)

Bit 7
SSBY
Initial value 0
Read/Write R/W
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).
6 5
STS2 STS1 STS0
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
Abbreviation
SYSCR
MSTCRH
MSTCRL
4 3 2
UE NMIEG
0 1 0
R/W R/W
NMI edge select
User bit enable
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
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