HP 3000 III Series Manual page 207

System Microcode
Table 5-6. Store Field Code Definitions (Continued)
1--- . -
--~~-------'l'---'----I -------~_._------.-----~-
1 I
Field
1
1
Label and Name
1
Code
I
Description
1 I 1
QUP
(Stack Marker
Pointer UP)
RA
RAR
(ROM Address
Register)
RB
RC
RD
SBR
(Stack Bank
Register)
10001
11011
10111
11010
11001
11000
00110
The Store fie ld code QUP e ffective-
ly inserts the U-Bus word into the
stack at location SM plus one.
Refer to para 5-5.
The Store field code RA stores the
U-Bus word in the register named RA
by the Narner Register.* Refer to
para 2-96 and 5-2.
The Store field code RAR stores
bits 0 thru 15 of the U-Bus in ROM
Address Register bits 0 thru 15.
1
The intent of this code is to force
I
the processor to a new microprogram
I
address specified by the U-Bus
1
word. Execution of the RAR code re-I
quires three microcycles. The- firstl
cycle loads the ROM Address Regist-
er and the next two cycles are NOPs
allowing the ROM Output Registers
(RORI and ROR2) to be loaded with
the new microinstruction.
The Store field code
RB
stores the
U-Bus word in the register named
RB
by the Namer Register.* Refer to
para 2-96 and 5-2.
The Store field code RC stores the
U-Bus word in the register named RC
by the Namer Register. * Refer to
para 2-96 and 5-2.
The Store field code RD stores the
U-Bus word in the register named RD
by the Namer Register.* Refer to
para 2-96 and 5-2.
The Store field code SBR stores U-
Bus bits 12:15 in the Bank Register
specified in the MCU field code.
1-------------_·_-----_·_--- --.-.-.- --
--.-.-------.------~---.-------------------
----
I*True only if RA:RD are being used as part of the stack, RA:RD
I
often are used by the microp rogr am as sera tch pad register
s
I
when not used otherwise.
1
5-27