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18.1 EPROM mode
The PROM version can select the normal operating mode which performs the same operation as that of the
mask ROM version, or the EPROM mode which enables to program/read to/from the built-in PROM.
When "L" level is input to the RESET pin, the PROM version enters the EPROM mode.
18.1.1 Pin description
Table 18.1.2 lists the pin description in the EPROM mode.
Table 18.1.2 Pin description in EPROM mode
Pin
V
, V
Power source input
CC
SS
CNV
V
input
SS
PP
BYTE
______
RESET
Reset input
X
Clock input
IN
X
Clock output
OUT
_
E
Enable output
AV
, AV
Analog power source input
CC
SS
V
Reference voltage input
REF
P0
–P0
Address input (A
0
7
P1
–P1
Address input (A
0
7
P2
–P2
Data input/output (D
0
7
P3
–P3
Input port P3
0
3
P4
–P4
Input port P4
0
7
P5
Control input
0
P5
1
P5
2
P5
–P5
Input port P5
3
6
P5
7
P6
–P6
Input port P6
0
7
P7
–P7
Input port P7
0
7
P8
–P8
Input port P8
0
7
______
Name
Input/Output
Output
Output
–A
)
0
7
–A
)
8
15
–D
)
0
7
7751 Group User's Manual
Apply 5 V ± 10% to V
––
Apply V
level when programming or verifying.
Input
PP
Connect to V
Input
Connect a ceramic resonator or a quartz-crystal
Input
oscillator between X
external generated clock is input, the clock must
be input to X
Open.
Connect AV
––
CC
Connect to V
Input
Input pins for A
Input
Input pins for A
Input
I/O pins for data D
I/O
Connect to V
Input
Connect to V
Input
P5
functions as PGM input pin.
Input
0
P5
functions as OE input pin.
1
P5
functions as CE input pin.
2
Connect to V
Connect to V
Connect to V
Input
Input
Input
PROM VERSION
18.1 EPROM mode
Functions
pin, and 0 V to V
CC
pin.
SS
and X
pins. When an
IN
OUT
pin, and X
pin must be left open.
IN
OUT
pin to V
pin and AV
pin to V
CC
SS
pin.
SS
–A
of addresses.
0
7
–A
of addresses.
8
15
–D
.
0
7
pin.
SS
pin.
SS
_____
___
___
pin.
CC
pin.
SS
pin.
SS
pin.
SS
pin.
SS
18–3
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