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LCD-IV--------------------------------------------------------------------
jumps (including interrupts).
CAL is a conditional instruction and executed only when the
Status F
IF
is "1". If the Status F
IF
is "0", it is skipped and the
Status F/F changes to "1".
• CALL
By CALL instruction, subroutine jump to an address in any
bank and page is performed.
Subroutine jump to any address can be implemented by the
subroutine jump to the page specified by LPU instruction in the
bank designated by the reversed-phase signal R
70.
This instruction is a macro instruction of LPU and CAL
instructions, which is divided into two instructions as follows.
CALL
a·b - L P U
a
CAL b
<
Subroutine Jump to Bank "R70 ", a Page - b Address>
CALL instruction is conditional because of characteristics of
LPU and CAL instructions and is executed when the Status F/F
is "1". If the Status F IF is "0", the instruction is skipped and
the Status F
IF
changes to "1". The examples of CALL instruc-
tion are shown in Figure 11.
/
(Page Part)
\
Ban~a;
r---
Page Part
~
r - -
Address Part
~
(PC)
(Modification)
~ ~2
=
~,
=
~
:
C
B3: Bo : B,
Bo
I
A3 : Ao : A, : Ao
I
(PC after TBR
Instruction)
Figure 9 Modification of Program Counter by TBR Instruction
0.
_ _ _ _ _ _ 0,
ROM
;
: :
PC
~~k
[J I
I : r
~~
+
j : j
II : I
:A!d')~
I :
I
J
l l l l l l l l l l l
ST1
I : : : : : : : : : :
ST2
ST3
: :
ST4
: :
Figure
10
Subroutine Jump Stacking Order
192
(PC +
1)
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