HMCS404C------------------------------------------------------------
Instruction
(P)
OP
Code
"0" "0"
Referred
ROM
Address
RA
13
RA.
2
RAIIRA.
o
RA9
RA.
(a)
Address Designation
:
If
ROB
= 1
:
If
R0
9
= 1
(b) Pattern Output
Fig. 23 P Instruction
• P Instruction
The P instruction refers
ROM
data addressed by Table Data
Addressing.
ROM
data addressed also determine its destination.
When bit 8
in
referred
ROM
data
is
"I",
8 bits
of
referred
NOP
8A
AAA 256n + 254
~_=BR~BB=B
__
_I~::~n:2,~5
Fig.24 The Branch Destination by
BR
Instruction on
the Boundary between
Pages
ROM
data
are
written into the accumulator and B Register.
When bit 9
is
"I",
8 bits
of
referred
ROM
data are written into
the
RI
and
R2
port
output
register.
When
both bit 8 and 9 are
"I",
ROM
data are written into the accumulator and B Register
and also to the
Rl
and
R2
port output register at a same time.
The P instruction has no effect on
the
program counter.
• INSTRUCTION SET
The HMCS400 series provide 99 instructions. These instruc-
tions are classified into 10 groups
as
follows;
(I)
Immediate Instruction
252
(2) Register-to-Register Instruction
(3)
RAM
Address Instruction
(4)
RAM
Register Instruction
(5) Arithmetic Instruction
(6) Compare Instruction
(7)
RAM
Bit Manipulation Instruction
(8)
ROM
Address Instruction
(9) Input/Output Instruction
(10) Control Instruction
To Next Page
