
7902 Group User’s Manual
APPENDIX
21-6
Appendix 1. Memory assigment in SFR area
: 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.
: The written value becomes valid. It is impossible to read the bit state.
: Nothing is assigned. It is impossible to read the bit state. The written value becomes invalid.
RW
RO
WO
Access characteristics
0
1
?
: “0” immediately after reset.
: “1” immediately after reset.
: Undefined immediately after
reset.
: Always “0” at reading.
: Always “1” at reading.
: Always undefined at reading.
: “0” immediately after reset. Fix this bit to “0.”
0
?
1
State immediately after reset
0
RO
0
1
RW
0
?
1
00
0
00
0
00
1
0
00
0
00
0
1
0
00
0
1
0
00
0
1
0
(Note 15)
1
0
1
0
8016
8116
8216
8316
8416
8516
8616
8716
8816
8916
9016
9116
9216
9316
9416
9516
9616
9716
9816
9916
9A16
9B16
9C16
9D16
9E16
9F16
8B16
8C16
8D16
8E16
8F16
8A16
CS0 control register H
CS0 control register L
b7
b0
b7
RW
b0
RW
RO
RW
?
CS1 control register H
CS1 control register L
CS2 control register H
CS2 control register L
CS3 control register H
CS3 control register L
Area CS0 start address register
Area CS1 start address register
Area CS2 start address register
Area CS3 start address register
RW
RO
RW
00
0
1
0
00
0
00
0
00
0
00
?
0
00
0
00
?
0
00
0
00
0
00
0
00
?
(Note 16)
RW
(Note 17)
Flash memory control register (Note 18)
D-A register 2
D-A register 1
D-A register 0
D-A control register
External interrupt input read-out register
External interrupt input control register
Port function control register
0
1
RW
Register name
Address
Access characteristics
State immediately after reset
Notes 15 : This bit is “0” when Vss-level voltage is applied to pin MD0; this bit is “1” when Vcc-level voltage is applied.
16 : This bit is “0” when Vss-level voltage is applied to pin BYTE; this bit is “1” when Vcc-level voltage is applied.
17 : Do not write.
18 : This register is allocated only to the flash memory version. (Refer to “CHAPTER 20. FLASH MEMORY
VERSION.”) Do not write to this register in the mask ROM and external ROM versions.
0
0016
00
0