Computer Hardware User Manual

194
Flags ER: Indirectly addressed DM word is non-existent. (Content of DM word is
not BCD, or the DM area boundary has been exceeded.)
EQ: ON if Cp1 equals Cp2.
LE: ON if Cp1 is less than Cp2.
GR: ON if Cp1 is greater than Cp2.
Flag Address C1 < C2 C1 = C2 C1 > C2
GR 25505 OFF OFF ON
EQ 25506 OFF ON OFF
LE 25507 ON OFF OFF
The following example shows how to save the comparison result immediately. If
the content of HR 09 is greater than that of 010, 00200 is turned ON; if the two
contents are equal, 00201 is turned ON; if content of HR 09 is less than that of
010, 00202 is turned ON. In some applications, only one of the three OUTs would
be necessary, making the use of TR 0 unnecessary. With this type of program-
ming, 00200, 00201, and 00202 are changed only when CMP(20) is executed.
CMP(20)
010
HR 09
00000
25505
00200
25507
00202
TR
0
25506
00201
Greater Than
Equal
Less Than
Address Instruction Operands Address Instruction Operands
00000 LD 00000
00001 OUT TR 0
00002 CMP(20)
010
HR 09
00003 LD TR 0
00004 AND 25505
00005 OUT 00200
00006 LD TR 0
00007 AND 25506
00008 OUT 00201
00009 LD TR 0
00010 AND 25507
00011 OUT 00202
The following example uses TIM, CMP(20), and the LE flag (25507) to produce
outputs at particular times in the timer’s countdown. The timer is started by turn-
ing ON 00000. When 00000 is OFF, TIM 010 is reset and the second two
CMP(20)s are not executed (i.e., executed with OFF execution conditions). Out-
put 00200 is produced after 100 seconds; output 00201, after 200 seconds; out-
put 00202, after 300 seconds; and output 00204, after 500 seconds.
Example 1:
Saving CMP(20) Results
Example 2:
Obtaining Indications
during Timer Operation
Data Comparison Section 5-17