Datasheet

Section 3 MCU Operating Modes
Rev.6.00 Mar. 18, 2009 Page 59 of 980
REJ09B0050-0600
Bit Bit Name Initial Value R/W Descriptions
7, 6
− All 1 R/W
R/W
Reserved
The initial value should not be modified.
5, 4 − All 0 R/W
R/W
Reserved
The initial value should not be modified.
3 FLSHE 0 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
2 − 0 − Reserved
This bit is always read as 0 and cannot be modified.
1 EXPE − R/W External Bus Mode Enable
Sets external bus mode.
In modes 1, 2, and 4, 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
0 RAME 1 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