HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 439

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

16.3.3
1. Always write using the prescribed voltage and timing. The write voltage (programming
2. Before programming, always check that the indexes of the EPROM writer socket, socket
3. Do not touch the socket adapter or device during writing. Contact can cause malfunctions that
428 HITACHI
Note: t
V
V
voltage) V
HN27C101, V
damage the device. Pay particular attention to overshooting in the EPROM writer.
adapter, and devices are consistent with each other. If they are not mounted in the proper
location, an overcurrent may be generated, damaging the device.
prevent data from being written accurately.
CC
PP
Address
V
Points to Note About Writing
CC
PGM
OPW
Data
V
V
V
OE
+ 1
CE
CC
CC
PP
PP
is defined as the value given in the flowchart.
is 12.5 V (when the EPROM writer is set to the Hitachi specifications for
PP
becomes 12.5 V.) Applying a voltage in excess of the rated voltage may
t
t
t
t
t
VCS
CES
VPS
AS
DS
Figure 16.5 Write/Verify Timing
(t
Write data
t
OPW
PW
)
Write
t
DH
t
OES
t
OE
Read data
Verify
t
t
DF
AH