HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 314

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

17.3.2 Notes on Writing
1. Write with the specified voltages and timing. The programming voltage (Vpp) in the
Caution: Applied voltages in excess of the specified values can permanently destroy to the chip.
Be particularly careful about the PROM writer’s overshoot characteristics.
If the PROM writer is set to Intel specifications or Hitachi HN27256 or HN27C256 specifications,
Vpp will be 12.5V.
2. Before writing data, check that the socket adapter and chip are correctly mounted in the
PROM mode is 12.5V.
PROM writer. Overcurrent damage to the chip can result if the index marks on the PROM
writer, socket adapter, and chip are not correctly aligned.
Address
Data
V
CE
OE
V
cc
pp
V
V
GND
pp
cc
V
cc
t
t
t
t
VPS
VCS
AS
DS
Input data
Figure 17-5 PROM Write/Verify Timing
t
t
OPW
PW
Write
t
DH
302
t
OES
t
OE
Verify
Output data
t
t
DF
AH