UPD70732 datasheet(16/66 Pages) NEC

16 / 66 page

µPD70732

3.1.2 Integer

In the V810, all integers are expressed in the two’s-complement binary notation, and are composed of either

8 bits, 16 bits, or 32 bits. Regardless of the data length, bit 0 is the least significant bit, and higher-numbered

bits express higher digits of the integer with the highest bit expressing its sign.

Data Length

Range

Byte

8 bits

–128 to +127

Halfword

16 bits

–32768 to +32767

Word

32 bits

–2147483648 to +2147483647

3.1.3 Unsigned integer

An unsigned integer is either zero or a positive integer unlike the integer explained in section 3.1.2 which can

be negative as well as zero and positive. Unsigned integers are expressed in the binary notation in the same way

as integers, and are either 8 bits, 16 bits, or 32 bits long. Regardless of the data length, the bit assignments are

the same as in the case of integers except that unsigned integers do not include a sign bit; the highest bit is also

a part of the integer.

Data Length

Range

Byte

8 bits

0 to 255

Halfword

16 bits

0 to 65535

Word

32 bits

0 to 4294967295

3.1.4 Bit string

A bit string is a type of data whose bit length is variable from 0 to 232 – 1. To specify a bit-string data, define

the following three attributes.

• A : address of the string data’s first word (lower two bits must be 0.)

• B : in-word bit offset in the string data (0 to 31)

• M : bit length of the string data (0 to 232 – 1)

The above three attributes may vary depending on the bit-string data manipulation direction: upward or

downward, as shown below. The former is the direction from lower addresses to higher addresses while the latter

is the direction from higher to lower addresses.

Attribute

Upward

Downward

First-word address (0s in bits 1 and 0)

A + 4

In-word bit offset (0 to 31)

Bit length (0 to 232 – 1)

A + 8

M– 1

A + 4

A (Word boundary)

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