ST20C4 datasheet(15/212 Pages) STMICROELECTRONICS

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• if condition

statement

else if

condition

statement

else

statement

These conditions can be nested. Braces, {}, are used to group statements which are

dependent on a condition. For example, the

cj (conditional jump) instruction contains

the following lines:

if (Areg = 0)

IptrReg

′← next instruction + n

Symbol

Meaning

Integer arithmetic with overflow checking

checked

−

checked

Add, subtract, and multiply of signed integers. If the computation overflows an

IntegerOverflow is signalled and the result of the operation is truncated to the

word length.

Unchecked (modulo) integer arithmetic

−

rem

Integer add, subtract, multiply, divide and remainder. If the computation over-

flo ws the result of the operation is truncated to the word length. If a divide or

remainder by zero occurs the result of the operation is undefined. No errors are

signalled. The operator ‘

−’ is also used as a monadic operator. The sign of the

remainder is the same as the sign of the dividend.

Signed comparison operators

≤

≥

≠

Comparisons of signed integer and floating point v alues: ‘less than’, ‘greater

than’, ‘less than or equal’, ‘greater than or equal’, ‘equal’ and ‘not equal’.

Unsigned comparison operators

unsigned

≥

unsigned

after

Comparisons of unsigned integer values: ‘less than’, ‘greater than’, ‘greater than

or equal’, and ‘after’ (for comparison of times).

Logical bitwise operations

∼ (or BITNOT)

∧ (or BITAND)

∨ (or BITOR)

⊗ (or BITXOR)

‘Not’ (1’s complement), ‘and’, ‘or’, ‘exclusive or’, and logical left and right shift

operations on bits in words.

Boolean operators

not

and

Boolean combination in conditionals.

Table 1.7 Operators used in the instruction descriptions

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