Hitachi AP1 Data Book page 195

------------------------------------------------------------------LCO-IV
Subroutine Jump to Bank 0
• RAM
• LAI 15
.. --LA A 7
~~PU 5 )
CAL
3F;
• LAI 15
LBA
'-LAA
: COMB
'.LPU 31
1
CAL 3F
J
A,o
=
"1" (A,o
=
"0")
CALL 5-3F
(Subroutine Jump to Bank 0 5-3F (5-3F))
A,o
=
"1" (A,o
=
"0")
CALL 31-3F
(Subroutine Jump to Bank 0 31-3F (31-3F))
RAM is the memory used for data storage and register save
(data RAM) and storage of segment data for liquid crystal
display (display data RAM). Its capacity is 256 digits (1,024
bits) where one digit consists of 4 bits.
(Note I) Capacity of display data RAM varies by contents of
display, and capacity of data RAM changes corre-
sponding to the former.
Subroutine Jump to Bank 1
(Note 2) On the LCD-IV, RAM contents is not broken at
system reset.
Addressing of RAM is performed by a matrix of the file No.
and the digit No. Normally the file No. is set to X and the digit
No. is set to Y, then the matrix of X and Y addresses RAM and
performs the Read/Write operation. Special digits in RAM can
be addressed without the use of X and Y. These digits are calJed
as memory ragister (MR) and the number is 16 (MRO - MR 15).
Memory register can be exchanged for A register by XAMR
instruction. RAM address space is shown in Figure 12.
• LAI 0
'-LAA 7
~.LPU
15)
CAL 3F
J
LAI
0
LTA
-LAA
7
LVI
3
XMA
·LPU
10 )
CAL
2E
J
A,o
=
"0"
(R,;;
=
"1")
CALL 15-3F
(Subroutine Jump to Bank 1 15-3F (47-3F))
A,o
=
"0" (A,o
=
"1")
CALL 10-2E
(Subroutine Jump to Bank 1 10-2E (42-2E))
Figure 11 CALL Example
Y
register
Digit No.
Figure 12 RAM Address Space
193
(NOTE) The area marked as
c=:=:J
is usable
only for data.
The area marked as _ is usable
for both liquid crystal display and
data.