Toshiba T2N User Manual download pdf (Page 199)

3. User Data

186 PROSEC T2N

There is a method called ‘digit designation’ which is a special

designation method for register data. ‘Digit designation’ treats 1 digit (4

bits) of a hexadecimal number as a data unit. It is a method of

designation in which a number of digits from the designated devices (bit

positions) are made the subject of data operation. Digit designation can

be used by the transfer (FUN18) and data echange (FUN22) instructions.

In practice, in the case of the following Example, 2 digits from X0008 (that is

to say, the upper 8 bits of XW000) become the subject of data operation.

Example)

There are 5 types of digit designation - Q0, Q1, ..., Q4 which have the

following significations

Q0 ... makes the designated device 1 bit the subject of data operation

Q1 ... makes 1 digit (4 bits) with the designated device as the lead the

subject of data operation

Q2 ... makes 2 digits (8 bits) with the designated device as the lead the

subject of data operation

Q3 ... makes 3 digits (12 bits) with the designated device as the lead the

subject of data operation

Q4 ... makes 4 digits (16 bits) with the designated device as the lead the

subject of data operation

Q5 to Q8 cannot be used by the T2N.

In digit designation, when the area designated covers multiple registers,

as shown below, the area is designated from the smaller address to the

greater address.

Example)

3.5

Digit Designation

NOTE

R030C

FB 0

RW030RW031

The 16 bits R030C to R031B (R030C is the lowest

position bit as a numerical value)

FC 0

Digit designation (in this case 2-digit designation)

Digit designation leading device

FCB87430

2nd digit 1st digit

X008

designates the hatched line area

1 2 ... 194 195 196 197 198 199 200 201 202 203 204 ... 271 272

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Toshiba T2N User Manual Page 199