Xerox 560 Reference Manual

WRITE INTO INTERNAL CONTROL REGISTER
The
following configuration of WD is used to write into the
internal control (or O) registers:
If the R field is nonzero, the contents of register Rare
loaded in the control register, as specified by the 110 Ad-
dress
ll
field (bit positions 27-31) of the WD instruction.
Except for the four 0 addresses listed below, all other ad-
dresses are reserved:
o Address
Significance
X'lD'
{
(Bits
00-13) - Reserved.
(Bits
14-31) - Write into the IIBranch From II
program counter.
X'lE'
{
(Bits
00 through 07) - Reserved.
(Bits 08 through 3l) - Write into the IILoad
Device Address
ll
register.
If the R field is zero, the specified register is loaded with
all zeros.
Affected: (EL)
(R) - (EL)
WRITE DIRECT, INTERRUPT CONTROL (MODE 1)
The following configuration of WD is used to set and reset
the various states of the individual interrupt levels within
the basi c processor interrupt system:
Bits 28-31 of the effective address specify the identifi cation
number (see Table 11) of the group of interrupt levels to be
controlled by the WD instruction.
126 Control Instructions
The R field of the WD instruction specifies a general register
that contains the selection bits for the individual interrupt
levels within the specified group. For external interrupt
groups, bit 16 of register R contains the selection bit for
the highest-priority (lowest-numbered) interrupt level within
the group, and bit 31 of register R contains the selection bit
for the lowest-priority (highest-numbered) interrupt level
within the group. For assignments in Group X'O', see Table 11.
Except for Power on/Power off interrupt levels, which can
not be disabled, disarmed, or inhibited, each level in the
designated group is operated on according to the function
code specified by bits 21-23 of the effective address of WD.
The codes and their associated functions are as follows:
Code Function
000 Setactive all selected levels currently in the armed
or waiting states.
001
t
Disarm all levels selected by a 1; all levels se-
lected by a 0 are not affected.
o lOt Arm and enable all levels selected by a 1; all
levels selected by a 0 are not affected.
011
t
100
101
110
Arm and disable all levels selected by a 1; all
levels selected by a 0 are not affected.
Enable all levels selected by a 1; all levels selec-
ted by a 0 are not affected.
Disable all levels selected by a 1; all levels selec-
ted by a 0 are not affected.
Enable all levels selected by a 1 and disable all
levels selected by a O.
111 Trigger all levels selected by a 1. All such levels
that are currently armed advance to waiting state.
tThese codes clear the current interrupts! i. e.! remove from
the active or waiting state all levels selected by a 1 (see
Figure 12).

Xerox 560 Specifications

General

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Monthly Duty Cycle	Up to 300, 000 pages
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