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--------------------------------------------------------HMCS45C,HMCS45CL
""
X
0
....
N
C")
'Ct
In
co
"
:..
....
I
co
in
....
I
N
....
y
~
0
....
N
C")
'Ct
In
co
"
co
0)
i
file No .
15 14 13 12 11 10
15 14 13 12 11 10
In
'Ct
C")
N
....
0
a: a: a: a: a: a:
::E
::E ::E ::E
::E ::E
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
<-
digit No.
--
0)
co
"
co
In
'Ct
C")
N
a:
0
a: a:
a: a: a: a: a: a:
a:
::E ::E
::E ::E ::E ::E ::E ::E
::E ::E
• The file 8 is selected when X register has any value in 8 to 11, and the file
9 is selected when 12 to 15.
2
3
22 2' 2
0
n
I
01
0
o
11
o
10:
3
n
=
Bit assignment No
Figure 10 RAM Address Space
M(O)
M(l)
M(2)
M(3)
• REGISTER
The HMCS45C has six4-bit registers and two I-bit registers
available to the programmer. The I-bit registers are the Carry
FI
F and the Status
F/F.
They are explained in the following para-
graphs.
• Status F/F (5)
The Status
F/F
latches the result of logical or arithmetic oper-
ations (Not Zero. Overflow) and bit test operations, The Status
F/F
affects conditional instructions (LPU. BR and CAL instruc-
tions), These instructions are executed only when the Status
F/F
is
"t".
If it is "0". these instructions are skipped and the Status
F/F
becomes "t",
Figure 11
RAM Bit and Operand n
71
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