HD643303x Hitachi, HD643303x Datasheet - Page 406

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

13.2 System Control Register (SYSCR)
One function of SYSCR is to enable or disable access to the on-chip RAM. The on-chip RAM is
enabled or disabled by the RAME bit in SYSCR. For details about the other bits, see section 3.3,
System Control Register.
B
initialized at the rising edge of the input at the RES pin. It is not initialized in software standby
mode.
Bit 0
RAME
0
1
Bit
Initial value
Read/Write
it 0—RAM Enable (RAME): Enables or disables the on-chip RAM. The RAME bit is
Description
On-chip RAM is disabled
On-chip RAM is enabled
Software standby
SSBY
R/W
7
0
STS2
R/W
6
0
Standby timer select 2 to 0
STS1
R/W
5
0
391
STS0
R/W
4
0
User bit enable
R/W
UE
3
1
NMIEG
R/W
NMI edge select
2
0
Reserved bit
—
—
1
1
RAM enable bit
Enables or
disables
on-chip RAM
(Initial value)
RAME
R/W
0
1