Hitachi H8S/2678 Series Reference Manual page 569

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

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