H8SSLASH2225 datasheet(849/1071 Pages) RENESAS

849 / 1071 page

Section 22 PROM

Rev. 5.00 Aug 08, 2006 page 763 of 982

REJ09B0054-0500

Program

Verification

Input data

Output data

tAS

tAH

tDF

tDH

tDS

tVPS

tVCS

tCES

tPW

tOPW*

tOES

tOE

Address

Data

VPP

VCC

PGM

VPP

VCC

VCC +1

VCC

Note: * tOPW is defined by the value shown in the flowchart.

Figure 22.5 PROM Programming/Verification Timing

22.3.2

Programming Precautions

• Program using the specified voltages and timing.

The programming voltage (VPP) in PROM mode is 12.5 V.

Applied voltages in excess of the specified values can permanently destroy the MCU. Be

particularly careful about the PROM programmer’s overshoot characteristics.

If the PROM programmer is set to Renesas Technology HN27C101 specifications, VPP will be

12.5 V.

• Before programming, check that the MCU is correctly mounted in the PROM programmer.

Overcurrent damage to the MCU can result if the index marks on the PROM programmer,

socket adapter, and MCU are not correctly aligned.

• Do not touch the socket adapter or MCU while programming. Touching either of these can

cause contact faults and programming errors.

• The MCU cannot be programmed in page programming mode. Select the programming mode

carefully.

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