Hitachi H8S/2378, H8S/2378R Series Hardware Manual page 99

Bit Bit Name Initial Value
−
7 1
−
6 1
−
5 0
−
4 0
3 FLSHE 0
−
2 0
−
1 EXPE
0 RAME 1
R/W Descriptions
R/W Reserved
R/W The initial value should not be modified.
R/W Reserved
The initial value should not be modified.
R/W
R/W Flash Memory Control Register Enable
Controls CPU access to the flash memory control
registers (FLMCR1, FLMCR2, EBR1, and EBR2). If
this bit is set to 1, the flash memory control registers
can be read/written to. If this bit is cleared to 0, the
flash memory control registers are not selected. At this
time, the contents of the flash memory control registers
are maintained. This bit should be written to 0 in other
than flash memory version.
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
−
Reserved
This bit is always read as 0 and cannot be modified.
R/W External Bus Mode Enable
Sets external bus mode.
In modes 1, 2, and 4 to 6, this bit is fixed at 1 and
cannot be modified. In mode 3* and 7, this bit has an
initial value of 0, and can be read and written.
Writing of 0 to EXPE when its value is 1 should only be
carried out when an external bus cycle is not being
executed.
0: External bus disabled
1: External bus enabled
R/W RAM Enable
Enables or disables the on-chip RAM. The RAME bit is
initialized when the reset status is released.
0: On-chip RAM is disabled
1: On-chip RAM is enabled
Rev. 1.0, 09/01, page 55 of 904