Filter
Top Products
USER’S GUIDE
050396 140/173
141
PARALLEL PROGRAM LOAD OPERATION
The DS5000 Parallel Program Load mode is compatible
with the Program mode of the 87C51. The hardware
configuration used for this mode of operation is shown in
Figure 16–3. Dallas Semiconductor recommends the
use of the serial Program Load Mode over the Parallel
Program Load Mode because of the ease of imple-
mentation and simpler hardware interface.
PARALLEL PROGRAM LOAD CONFIGURATION Figure 16–3
ALE/PROG
PSEN
RST
D7–D0
A15–A12 PROGRAM ADDRESS
PROGRAM DATA IN/
VERIFY DATA OUT
A7–A0
A11–A8
PROGRAM
ADDRESS
PROGRAM
CONTROL
V
CC
GND
DS5000
P1.7–
P1.0
P2.3–
P2.0
EA/V
PP
P2.7
P2.6
P2.5
XTAL1
XTAL2
P0.7–
P0.0
P3.7–
P3.4
PARALLEL PROGRAM LOAD CYCLES Figure 16–4
ALE/PROG
ADDRESS
DATA IN
ADDRESS
DATA OUT
PROGRAM CYCLE VERIFY CYCLE SECURITY SET
CYCLE
P2.3–P2.0
P1.7–P1.0
PORT 0
EA/V
PP
P2.7
P2.6
V
PP
V
IH