Special Field Code Definitions - HP 3000 III Series Manual

System Microcode
Table 5-7. Special Field Code Definitions
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I I
Field
I I
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Label and Name
I
Code
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Description
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(blank) 11111 No Special fie Id ope ra tion.
I
I
CCA 11110 The Special field code CCA sets the
(Condition Code A) condition code bits to CCL (01) if
the T-Bus word is less than zero
(T( 0)
=
1), CCE (10) if the T-Bus
word is equal to zero (Signal T
=
0
is true), or CCG (00) if the T-Bus
word is greater than zero (T(O)
=
0
and signal T
=
0 is false).
CCB 00000
(Condition Code B)
CCE 11101
(Condi tion Code E)
I
CCG
11100
(Condition Code G)
CCL
11011
(Condition Code L)
CCPX
00001
(Clear CPXl)
The Special field code CCB sets the
condition code to CCL (01) if bits
8:15 of the U-Bus form a special
ASCII character, CCE (10) if an
alphabetic ASCII character, or CCG
(00) if a numeric ASCII character.
The Special field code CCE sets the
condition code bits to CCE (10).
The Special field code CCG sets the
condition code bits to CCG (00).
The Special field code CCL sets the
condition code bits to CCL (01).
Clears the Interrupt Status Regist-
er bits as specified by the true
bits on the U-Bus.
U-Bus Bit 0 Halt
1 Run
2 Sys tern Hal t
3 (Unused)
Bits 4 (MSB) through 7
(LSB) code the following
functions:
Octal Code 0 NOP
1 Clear BNDV
2 Clear Ille-
gal Address
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