SH7040 Datasheet, PDF(717/923 Page) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

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SH7040 Datasheet, PDF (717/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

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Address

Data

VPP

VPP

VCC

VCC VCC + 1

VCC

Write

tAS

Write data

tDS

tDH

tVPS

tVCS

Verify

tAH

Read data

tDF

CE

tCES

PGM

tPW

(tOPW)*

tOES

tOE

OE

Note: * tOPW is defined by the values noted in the flowchart (figure 19.6).

Figure 21.7 Write/Verify Timing

21.3.3 Cautions on Writing

1. Writes must always be done with the established voltage and timing. The write voltage

(programming voltage) VPP is 12.5 V (when the EPROM writer is set for the HN27C101

Hitachi specifications, VPP becomes 12.5 V). Devices will sometimes be destroyed if a voltage

higher than the rated one is applied. Pay particular attention to such phenomena as EPROM

writer overshoot.

2. Always confirm that the indices of the EPROM writer socket, socket adapter, and device are in

agreement before programming. Devices will sometimes be destroyed due to excessive current

flow if these are not connected in the proper locations.

3. Do not touch the socket adapter or device during writing. Contact faults can sometimes cause

devices to be improperly written.

4. Page programming mode writes are not possible. Always set to byte programming mode.

679

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