m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 462

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Processor mode register 0
X : It may be either “0” or “1.”
Processor mode register 1
X : It may be either “0” or “1.”
Notes 1: After reset, this bit is allowed to be changed only once. (During the software execution, be sure not to change this bit’s
6 to 2
Bit
Bit
0
1
2
3
4
5
6
7
0
1
7
2: To reprogram the internal flash memory by using the CPU reprogramming mode, clear this bit to “0.” (Refer to section
content.)
“19.2 Flash memory CPU reprogramming mode.”)
Processor mode bits
Any of these bits may be either “0” or “1.”
Interrupt priority detection time
select bits
Software reset bit
Fix this bit to “0.”
This bit may be either “0” or “1.”
Direct page register switch bit
Fix these bits to “00000.”
Internal ROM bus cycle select bit
(Note 2)
Bit name
Bit name
(Address 5E
(Address 5F
16
16
7905 Group User’s Manual Rev.1.0
)
)
b5 b4
b1 b0
0 0 : 7 cycles of f
0 1 : 4 cycles of f
1 0 : 2 cycles of f
1 1 : Do not select.
The microcomputer is reset by writing “1” to this
bit. The value is “0” at reading.
0 0 : Single-chip mode
0 1 : Do not select.
1 0 : Do not select.
1 1 : Do not select.
0 : Only DPR0 is used.
1 : DPR0 through DPR3 are used.
0 : 3
1 : 2
sys
sys
sys
Function
Function
Appendix 2. Control registers
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
0
0 0 0 0 0
At reset
At reset
X X 0 0
APPENDIX
0
0
0
1
0
0
0
0
1
0
0
0
(Note 1)
R/W
R/W
WO
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
X
Reference
Reference
2-20
6-11
2-12
3-3
2-6
20-31