Intel MCS48 User Manual page 170

ID8048/8748/8035L
WAVEFORMS
FOR PROGRAMMING
COMBINATION PROGRAM/VERIFY MODE
(EPROM'S ONLY)
DB0-DB7
/
\
\
/
J
LAST
ADDRESS
/
ADDRESS
\J
~\
10-71
VALID
A
>czz
DATA TO
BE
PROGRAMMED
VALID
ADDRESS
(8-9)
VALID
7
'VDDH
twT-
•«
VERIFY-
\
\
r
-i
\_ /
V
DATA \_
/
NEXT ADDR \f
/
>
A
vald
r
\
^
lTd
A
x
1
J"
NEXT
ADDRESS
^.
VERIFY MODE
(ROM/EPROM)
\ / \
DBn-DB
7
\_
/
ADDRESS
\J
DATA OUT
\
_f
[
\
(0-7)
VALID
A
VALID
f^
^
P20-P1
X
ADDRESS
(8-9)
VALID
X
NOTES:
1.
PROG MUST FLOAT
IF
EA
IS
LOW
(i.e.,
*23V),
OR
IF
TO = 5V
FOR THE
8748.
FOR THE
8048
PROG MUST ALWAYS
FLOAT.
2.
Xi
AND X2 DRIVEN BY
3
MHz CLOCK
WILL GIVE
5psec tCY-
THIS
IS
ACCEPTABLE FOR
•8
PARTS AS
WELL AS
STANDARD
PARTS.
/
\
NEXT
ADDRESS
XNEXT
DATA
\^
OUT VALID
r"
NEXT ADDRESS VALID
The
8748
EPROM
can be programmed
by
either Of
two
Note:
See the
ROM/PROM
section
for
8048
ROM
ordering procedures.
Intel
products:
To
minimize turnaround
time
on
the
first
25 pieces 8648
may
be
specified
on
the
ROM
order.
1.
PROMPT-48
Microcomputer Design
Aid, or
2.
Universal
PROM
Programmer (UPP
series) peripheral
of the Intellec®
Development System
with a
UPP-848
Personality Card.
6-18