Intel MCS48 User Manual page 359

8278
Auto Increment
In
the
Left
Entry
mode, Auto Incrementing causes
the
address
where
the
CPU
will
next
write to
be incremented
by one and
the character
appears
in
the next
location.
With
non-Auto
Incrementing the entry
is
both
to
the
same
RAM
address and display
position.
Entry
to
an
arbitrary
address
in
the
Left
Entry
—
Auto Increment
mode
has
no
undesirable
side effects
and
the
result
is
predictable:
DISPLAY
12
3
4
5 6
7-«—
RAM
ADDRESS
1ST
ENTRY
1
1
2
3 4 5
6
7
2ND ENTRY
1
j
2
1
2 3 4 5 6 7
COMMAND
10010101
1
2
ENTER NEXT AT LOCATION
5
AUTO INCREMENT
12
3 4 5 6
7
3RD ENTRY
1
2
3
1
2 3
4
5 6 7
4TH ENTRY
1
2 3 4
In
the Right Entry
mode, Auto Incrementing
and non
Incrementing have
the
same
effect as
in
the Left Entry
except that the
address
sequence
is
interrupted:
1
2
3 4
5
6
7
0<
DISPLAY
—
RAM
1ST
ENTRY
|
ADDRESS
2 3 4 5 6 7
1
2ND
ENTRY
I
1
2
2
3 4 5 6 7
1
COMMAND
10010101
|
1
2
ENTER NEXT AT LOCATION
5
AUTO INCREMENT
3 4 5 6 7
12
3RD ENTRY
3
1
2
4
5 6 7
12
3
4TH ENTRY
3 4
1
2
Starting
at
an arbitrary location operates as
shown
below:
COMMAND
10010101
DISPLAY
12
3 4
5 6
7*—
RAM
ADDRESS
ENTER NEXT AT LOCATION
5
AUTO
INCREMENT
1
2 3
4
5
6
7
1ST
ENTRY
1
2 3 4 5 6 7
1
2ND ENTRY
1
2
8TH
ENTRY
4 5
6
7
8
1
2 3
9TH
ENTRY
5 6
7
8
9 2 3
4
Entry
appears
to
be from
the
initial
entry
point.
8-69
00227A