552
SYSCR—System Control Register
H'FF3D
System Control
Bit
Initial value
Read/Write
7
—
1
R/W
6
—
1
R/W
5
MACS
0
R/W
4
—
0
R/W
3
FLSHE
0
R/W
2
—
0
—
1
EXPE
—
*
R/W
0
RAME
1
R/W
0 On-chip RAM disabled
On-chip RAM enabled
RAM Enable
1
0 External bus disabled
External bus enabled
External Bus Mode Enable
1
0 Flash memory control registers are not selected
for area H'FFFFC8 to H'FFFFCB
Flash memory control registers are selected for
area H'FFFFC8 to H'FFFFCB
Flash Memory Control Register Enable
1
0 Non-saturating calculation for MAC instruction
Saturating calculation for MAC instruction
MAC Saturation
1
Note:
*
Determined by pins MD2 to MD0.
MDCR—Mode Control Register
H'FF3E
MCU
Bit
Initial value
Read/Write
7
—
0
—
6
—
0
—
5
—
0
—
4
—
0
—
3
—
0
—
2
MDS2
—
*
R
1
MDS1
—
*
R
0
MDS0
—
*
R
Current operating mode
designated by mode pins
Note:
*
Determined by pins MD2 to MD0.
Содержание H8S/2670
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