Technical data

The bits of the double control word are assigned as follows:
Control
word bit no.
Function
0 = ’1’ all time-driven interrupts in fixed interval delayed
1 = ’1’ the clock-driven time interrupt is disabled
2 = ’1’
all process interrupts are disabled
3 = ’1’ the delay interrupt is disabled
4 to 31 reserved; these bits must be "0"!
2. Accus
2a) ACCU-2-L
Function No.
Permissible values 1,2 or 3 with:
1: The contents of ACCU 1 are loaded
in the control word.
2: All the bits in the mask in ACCU 1
marked with a ’1’ are set to
’1’ in the
control word. The new control word is
loaded in ACCU 1.
3: All the bits in the mask in ACCU 1
marked with ’1’ are set to
’0’ in the
control word. The new control word is
loaded in ACCU 1.
2b)
ACCU1
New control word or mask, depending on the desired function
6
OB 120: Enabling/Disabling of Interrupts
CPU 928B Programming Guide
C79000-B8576-C898-01
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