HD6475348R Datasheet, PDF (328/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Address
Data
VPP
VPP
VCC
Write
tAS
Input data
tDS
tDH
tVPS
Verify
tAH
Output data
tDF
VCC ⁺¹
VCC
VCC
CE
PGM
OE
tVCS
tCES
tPW
tOES
tOE
Figure 17-7 PROM Write/Verify Timing (H8/536)
17.4.2 Notes on Programming
1. Program with the specified voltages and timing.
The programming voltage (VPP) in PROM mode is 12.5 V.
Caution: Applied voltages in excess of the specified values can permanently destroy the chip. Be
particularly careful about the PROM writer’s overshoot characteristics.
If the PROM writer is set to Hitachi HN27C101 specifications, VPP will be 12.5 V.
2. Before programming, check that the socket adapter and chip are correctly mounted in
the 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.
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