RCA 70/46 Reference Manual page 113

Program Control
(PC)
General Description
Format
(SI)
Condition Code
Interrupt Action
Note
Privileged
Instructions
• This instruction specifies the termination of program execution in the
current state, and the initiation of another state under control of the
immediate byte in the 12 field. The address computed from the Bl/Dl
address components of the instruction is stored in the P counter of the state
being terminated (bit positions 8-31).
82
o
7 8
15 16 19 20 31
• The condition code indicators of the state being terminated are preserved
in the state's P counter. The condition code in the P counter of the initiated
state is then used to set the condition code indicators.
• Privileged operation.
Address error:
Addressing.
• 1. The immediate byte in the 12 field of the instruction is divided
into four subfields as follows:
8 9
10
11
12 13 14 15
\ ..... - - _ r--...,I
V
\,-_~
.-_---J
1
v
Unused
Program
Test
Bit
Direct
State
Initiation
Indirect
Control Flag
Bits 8 through
10
are unused. The three bit unused portion must be zero.
Bit
11
is the program test bit. If bit 11
=
1, the program test mode
is initiated. The program test interrupt bit is set in the Interrupt Flag
register of the initiated state.
The scan of the Interrupt Flag register in the initiated state is delayed
until after the first instruction of the initiated state is executed, at which
time the scan is made in normal priority.
If bit 11
=
0, the program test mode is not initiated.
104