Pause Sensing Mask - Control Data 3100 Reference Manual

23 18 17 15 14 12 11
p
77 6 _
x
23
P+l
Reject Instruction
x
=
pause sensing mask code
00
00
(Approximate execution time:
1.8 jlsec.
to
40 ms.l
I
nstruction Description: This instruction allows the program to halt for a maximum of 40 ms
if a condition (excluding typewriter-see note) defined by the pause sensing mask exists. See
Table 7-7. If a
~~1"
appears on a line that corresponds to a mask bit that is set, the count in P will
not advance. If the advancement of P is delayed for more than 40 ms, a reject instruction is read
from address P+ 1. If none of the lines being sensed is active, or if they become inactive during
the pause, the program immediately skips to address P
+
2. If an interrupt occurs and is enabled
during a PAUS, the pause condition is terminated, the interrupt sequence is initiated and the
address of the PAUS instruction is stored as the interrupted address.
Comments: Bits 12 through 14 of the instruction at P should be loaded with zeros.
NOTE
If either bit 08,09 or 10 (or any combination of these bits) is set and the sensed condition exists,
a pause will not occur and the instruction at P
+
1 is read up immediately. If these bit(s) are set
but the condition(s) does not exist, the program immediately skips to P +·2. For all other bits,
the normal PAUS routine is followed.
TABLE 7-7. PAUSE SENSING MASK
Mask Bits Mask Codes Condition Notes
00 0001 1/0 channel 0 busy Channel read or write operation in
01 0002 1
progress, or the External MC logic
02 0004 2
within the channel is set
03 0010 3
04 0020
(Not used)
05 0040
(Not used)
06 0100 (Not used)
07 0200 (Not used)
08 0400 Typewriter busy
Typewriter input or output in progress
09 1000 Typewriter NOT finish Finish logic not set
10 2000 Typewriter NOT repeat
Repeat logic not set
11 4000
SearchlMove control busy Search or Move operation in progress
Rev. B
7-64