HD44797E---------------
The HD44797E
is
an evaluation chip for 4-bit single-chip
microcomputer LCD-III/IV. The HD44797E has the same logical
functions as LCD-III/IV except that its
ROM
is
external. All I/O
pins are open drain.
The HD44797E provides( 12-bit address outputs
(Ao
to All
terminals) and 5-bit instruction input pins
(0
1
/0
6
to 0
6
/010 pins)
for the external program memory.
",
and TSTP pins are required
for debugging programs, and
SELECT
pin
for selecting applicable
chips.
• APPLICABLE CHIPS
LCD-III.
LCD-IV
• FUNCTION
• Instruction
Characteristics etc.; Same
as
LCD-III. LCD-IV
•
Address External
ROM
(4k)
• I/O Pins
(D.
R.
INT ()o INT
1);
Open Drain
• PIN
NAME
V
l'
V
2
•
V3
OSC
1
m
: Power Supply
for
LCD
: External Clock Input
Pin
: Halt Pin
Roo
to
R03
: Input Port
RIO
to
R
23
: I/O Port
R30
to
R33
: Output Port
Do
to 0
13
: I/O Port
D
1
..
/XO.D
1
JXI
: I/O Port
or
Clock Input Pin
for
Timer
INT
()o
INT 1 : Interrupt
COM
1
to
COM
..
: Common Signal
Pin
SEG
1
to
SEG
32
: Segment Signal Pin
Ao to
All
: Program Memory Access Pin
0l/Oe
to
0J010:
Instruction Input Pin
",.
4>
1.
"'2 : Clock Signal
TSTP
: TimerlPrescaler Stop Signal Pin
SELECT
: Applicable Chips Selecting Pin
HD44797E
(FP-100)
• PIN
ARRANGEMENT
l-
N _
o~
;:::;;;
g
:::
:: ;;
~
!!
~
:
~~..:
~o
CCC0.~~~~~~~~~~~~I-~~
1111111111;
HD44797E
1::1T:1T:IT:lf::IT:IT;;
n:n
:0:0;11:11"1
:11
:11:11;11'11:11
=
......
2'
O-N~
........
2:~~~~~~ii
««««««00000000
(Note) • :
Additional
pin
for
evaluation
chip.
(Top
View)
294
~
GND
~
SEG
••
e
SEG.,
~
SEG.
o
~
SEG
••
;!
SEG
..
Po
SEG'
7
~
SEG
••
Po
SEG
..
~
SEG
••
~
SEG
••
~
SEG
••
~
SEG.,
~
SEG.
o
~
SEG,.
~
SEG
lO
~
SEG
17
~
SEG
..
~
SEG
..
~
SEG,.
g
SEG,.
~
SEG,.
~
SEG
l1
::
SEG,o
~
SEG.
~
SEG.
~.
SEG
7
~.
SEG.
~"
SEG.
" SEG.
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