HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 435

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 16.2 Select PROM Programming Mode
Mode
Write
Verify
Program inhibit
Symbols:
0: Low
1: High
V
V
16.3.2
Write/Verify: Write/verify can be accomplished by an efficient high-speed high-reliability
programming system. This system can write data quickly and accurately without placing voltage
stress on the device. The basic flowchart for this high-speed, high-reliability programming system
is shown in figure 16.4.
424 HITACHI
PP
CC
: V
: V
PP
CC
level
level
Write/Verify and Electrical Characteristics
CE
0
0
0
0
1
1
OE
1
0
0
1
0
1
PGM
0
1
0
1
0
1
Pin
V
V
PP
PP
V
V
CC
CC
I/O7–I/O0
Data input
Data output
High impedance
A16–A0
Address input