Toshiba CD332 - 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.