m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 441

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

APPENDIX
Appendix 2. Control registers
Appendix 2. Control registers
The control registers allocated in the SFR area are shown on the following pages.
Below is the structure diagram for all registers.
20-10
XXX register (address XX
1
2
3
4
Bit
0
1
2
3
4
5
6
7
Reference page for each bit.
Blank
0
1
0
1
Undefined
RW
RO
WO
—
• • • select bit
• • • select bit
• • • flag
Fix this bit to “0.”
This bit is invalid in … mode.
Nothing is assigned.
The value is “0” at reading.
: Invalid depending on the mode or state. It may be “0” or “1.”
: Nothing is assigned.
: Set to “0” or “1” according to the usage.
: Set to “0” at writing.
: Set to “1” at writing.
: It is possible to read the bit state at reading. The written value becomes valid.
: It is possible to read the bit state at reading. The written value becomes invalid. Accordingly, the written
: The written value becomes valid. It is impossible to read the bit state. The value is undefined at reading.
: It is impossible to read the bit state. The value is undefined at reading.
value may be “0” or “1.”
However, when [“0” at reading”] is indicated in the “Function” or “Note” column, the bit is always “0” at
reading. (See 5 above.)
However, when [“0” at reading”] is indicated in the “Function” or “Note” column, the bit is always “0” at
reading. (See 6 above.)
The written value becomes invalid. Accordingly, the written value may be “0” or “1.”
Bit name
: “0” immediately after reset.
: “1” immediately after reset.
: Undefined immediately after reset.
16
)
6
5
7905 Group User’s Manual Rev.1.0
b2 b1
0 0 : …
0 1 : …
1 0 : …
1 1 : …
0 : …
1 : …
The value is “0” at reading.
0 : …
1 : …
Function
2
3
b7 b6 b5 b4 b3 b2 b1 b0
X
Undefined
Undefined
0
At reset
0
0
0
0
0
0
1
R/W
WO
RW
RW
RW
RW
RO
–
–
Reference
3-10
3-11
2-6
4