Renesas 7700 FAMILY User Manual page 479

APPENDIX
Appendix 3. Control registers
Processor mode register 0
b7 b6 b5 b4 b3 b2
0 0
20–28
b1 b0
Processor mode register 0 (Address 5E
Bit
Processor mode bits
0
1
Fix this bit to "0."
2
Software reset bit
3
Interrupt priority detection time
4
select bits
5
Fix this bit to "0."
6
Clock output select bit
7 1
Notes 1: While supplying the Vcc level to the CNVss pin, this bit becomes "1." (Fixed to "1.")
2: This bit is ignored in the microprocessor mode. (It may be either "0" or "1.")
7751 Group User's Manual
)
16
Bit name
b1 b0
0 0 : Single-chip mode
0 1 : Memory expansion mode
1 0 : Microprocessor mode
1 1 : Not selected
The microcomputer is reset by
writing "1" to this bit. The value is
"0" at reading.
b5 b4
0 0 : 7 cycles of
0 1 : 4 cycles of
1 0 : 2 cycles of
1 1 : Not selected
0 : Clock
(P4
(Note 2) 2
I/O port.)
1 : Clock
(P4
2
put pin.)
Functions
output disabled
1
functions as a programmable
output enabled
1
functions as a clock out-
1
RW
At reset
0 RW
0
RW
(Note 1)
RW
0
0 WO
RW
0
RW
0
RW
0
0 RW