CHecK bounds

NAME
	CHK -- Check bounds

SYNOPSIS
	CHK	<ea>,Dn

	Size = (Word)
	Size = (Word, Long)	(68020+)

FUNCTION
	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.

FORMAT
	-----------------------------------------------------------------
	|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 |N reg. Dn| |    Abs.W      |111 |  000   |
	|-------------------------------| |-----------------------------|
	|      An       | -  |     -    | |    Abs.L      |111 |  001   |
	|-------------------------------| |-----------------------------|
	|     (An)      |010 |N reg. An| |   (d16,PC)    |111 |  010   |
	|-------------------------------| |-----------------------------|
	|     (An)+     |011 |N reg. An| |   (d8,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    -(An)      |100 |N reg. An| |   (bd,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    (d16,An)   |101 |N reg. An| |([bd,PC,Xi],od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (d8,An,Xi)  |110 |N reg. An| |([bd,PC],Xi,od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (bd,An,Xi)  |110 |N reg. An| |    #data      |111 |  100   |
	|-------------------------------| -------------------------------
	|([bd,An,Xi]od) |110 |N reg. An|
	|-------------------------------|
	|([bd,An],Xi,od)|110 |N reg. An|
	---------------------------------

SIZE
	11->one Word operation
	10->one Long operation

RESULT
	X - Not affected
	N - Set if Dn < 0; cleared if Dn > <ea>. Undefined otherwise.
	Z - Undefined.
	V - Undefined.
	C - Undefined.

SEE ALSO
	CMP  CMPI CMPA
	CHK2

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