I/o allocation – Toshiba CD332 User Manual
Page 23
User’s
Manual
19
4. I/O Allocation
The following table shows the function of each bit of the input register assigned to
the
CD332.
F E D C B A 9 8 7 6 5 4 3 2 1 0
XW(n)
Status
Data
Register
Bit
Name
Description
0
IN0 Indicates ON/OFF status of input IN0
1
IN1
Ditto
IN1
2
IN2
Ditto
IN2
3
Data
IN3
Ditto
IN3
4
IN4
Ditto
IN4
5
IN5
Ditto
IN5
6
IN6
Ditto
IN6
XW(n) 7 IN7
Ditto
IN7
8
IN0 Comes ON when interrupt is generated by IN0 changing
9
IN1
Ditto
IN1
changing
A
IN2
Ditto
IN2
changing
B
Status
IN3
Ditto
IN3
changing
C
IN4
Ditto
IN4
changing
D
IN5
Ditto
IN5
changing
E
IN6
Ditto
IN6
changing
F
IN7
Ditto
IN7
changing
The data of the CD332 can be read into the XW(n) register by using the Direct I/O
instruction (FUN235).
By executing the Direct I/O instruction, the interrupt flag (interrupt request) is reset to
OFF internally, and at the same time, the status bits are reset to OFF inside the CD332.