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4
The condition codes are as defined below:
BIT NO. LABEL CONDITION CODE
0 C Carry-borrow
1 V Overflow
2 Z Zero
3 N Negative
4 I Interrupt mask
5 H Half carry
In the above example the condition code of "3C" can be interpreted as follows:
3C
16
=
0 0 1 1 1 1 0 0
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
Below are two examples of how the R command works. Assume that this small program was
entered to change certain registers.
$M 0100
$0100 CE 8E LOADS STACK POINTER TO 100
$0101 12 10
$0102 34 00
$0103 86 CE LOAD INDEX REGISTER WITH 1234
$0104 00 12
$0105 C6 34
$0106 FF 86 LOAD ACCUMULATOR A WITH 00
$0107 FD 00
$0108 08 C6 LOAD ACCUMULATOR B WITH FF
$0109 23 FF
$010A 67 7E JUMP BACK TO SWTBUG CONTROL
$010B F7 E0
$010C 60 E3
$010D DD
AT THIS POINT THE STATUS WILL NOT BE PUSHED ON THE STACK