Compares the value in the data register specified to zero and to the upper bound. The upper bound is a twos complement integer. If the register value is less than zero or greater than the upper bound, a CHK instruction, vector number 6, occurs.
----------------------------------------------------------------- |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |---|---|---|---|-----------|-------|---|-----------|-----------| | 0 | 1 | 0 | 0 | REGISTER | SIZE | 0 | MODE | REGISTER | ----------------------------------------========================= <ea> REGISTER <ea> specifies upper bound, addressing modes allowed are: --------------------------------- ------------------------------- |Addressing Mode|Mode| Register | |Addressing Mode|Mode|Register| |-------------------------------| |-----------------------------| | Dn |000 |No reg. Dn| | (Abs).W |111 | 000 | |-------------------------------| |-----------------------------| | An | - | - | | (Abs).L |111 | 001 | |-------------------------------| |-----------------------------| | (An) |010 |No reg. An| | (d16,PC) |111 | 010 | |-------------------------------| |-----------------------------| | (An)+ |011 |No reg. An| | (d8,PC,Xi) |111 | 011 | |-------------------------------| |-----------------------------| | -(An) |100 |No reg. An| | (bd,PC,Xi) |111 | 011 | |-------------------------------| |-----------------------------| | (d16,An) |101 |No reg. An| |([bd,PC,Xi],od)|111 | 011 | |-------------------------------| |-----------------------------| | (d8,An,Xi) |110 |No reg. An| |([bd,PC],Xi,od)|111 | 011 | |-------------------------------| |-----------------------------| | (bd,An,Xi) |110 |No reg. An| | #data |111 | 100 | |-------------------------------| ------------------------------- |([bd,An,Xi],od)|110 |No reg. An| |-------------------------------| |([bd,An],Xi,od)|110 |No reg. An| --------------------------------- SIZE 11->one Word operation 10->one Long operation
X - Not affected N - Set if Dn < 0; cleared if Dn > <ea>. Undefined otherwise. Z - Undefined. V - Undefined. C - Undefined.