Bit Operands; Byte Operands; Short-Integer Operands; Word Operands - Intel 8XC196K Series User Manual

8XC196K x , J x , CA USER'S MANUAL
Table 3-2 lists the equivalent operand-type names for both C programming and assembly lan-
guage.
Table 3-2. Equivalent Operand Types for Assembly and C Programming Languages
Operand Types Assembly Language Equivalent
BYTE BYTE
SHORT-INTEGER BYTE
WORD WORD
INTEGER WORD
DOUBLE-WORD LONG
LONG-INTEGER LONG
3.1.1

BIT Operands

A BIT is a single-bit variable that can have the Boolean values, "true" and "false." The architec-
ture requires that BITs be addressed as components of BYTEs or WORDs. It does not support the
direct addressing of BITs.
3.1.2

BYTE Operands

A BYTE is an unsigned, 8-bit variable that can take on values from 0 through 255 (2
metic and relational operators can be applied to BYTE operands, but the result must be interpret-
ed in modulo 256 arithmetic. Logical operations on BYTEs are applied bitwise. Bits within
BYTEs are labeled from 0 to 7; bit 0 is the least-significant bit. There are no alignment restric-
tions for BYTEs, so they may be placed anywhere in the address space.
3.1.3

SHORT-INTEGER Operands

A SHORT-INTEGER is an 8-bit, signed variable that can take on values from –128 (–2
7
+127 (+2 –1). Arithmetic operations that generate results outside the range of a SHORT-INTE-
GER set the overflow flags in the PSW. The numeric result is the same as the result of the equiv-
alent operation on BYTE variables. There are no alignment restrictions on SHORT-INTEGERs,
so they may be placed anywhere in the address space.
3.1.4

WORD Operands

A WORD is an unsigned, 16-bit variable that can take on values from 0 through 65,535 (2
Arithmetic and relational operators can be applied to WORD operands, but the result must be in-
terpreted in modulo 65536 arithmetic. Logical operations on WORDs are applied bitwise. Bits
within WORDs are labeled from 0 to 15; bit 0 is the least-significant bit.
3-2
C Programming Language Equivalent
unsigned char
char
unsigned int
int
unsigned long
long
8
–1). Arith-
7
) through
16
–1).