UM0144 datasheet(20/92 Pages) STMICROELECTRONICS

20 / 92 page

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UM0144

Operators have 4 levels of precedence. Operators in level #1 (listed in

Table 4) take

precedence over operators in level #2 (listed in

Table 5), and so on. In each level, operators

have same precedence—they are evaluated from left to right.

Table 4.

Level 1 operators

Operation

Result, level #1

-a

negated a

a and b

logical AND of A and B

a or b

logical OR of A and B

a xor b

logical XOR of A and B

a shr b

a shifted right b times

a shl b

a shifted left b times

a lt b

1 if a<b, else 0

a gt b

1 if a>b, else 0

a eq b

1 if a=b, else 0

a ge b

1 if a>=b, else 0

a ne b

1 if a unequal b, else 0

high a

a/256, force arg to BYTE type

low a

a MOD 256, force arg to BYTE type

offset a

a MOD 65536, force arg to WORD*16 type

seg a

a/65536, force arg to WORD*16 type

bnot a

invert low 8 bits of a

wnot a

invert low 16 bits of a

lnot a

invert all 32 bits of a

sexbw a

sign extend byte to 16 bits

sexbl a

sign extend byte a to 32 bits

sexwl a

sign extend word to 32 bits

Table 5.

Level 2 operators

Operation

Result, level #2

a/b

a divided by b

a div b

a divided by b

Table 6.

Level 3 operators

Operation

Result, level #3

a * b

a multiplied by b

a mult b

as above for motorola (character * is reserved)

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