H838024 datasheet(194/697 Pages) RENESAS

194 / 697 page

Section 6 ROM

Rev. 7.00 Mar 10, 2005 page 152 of 652

REJ09B0042-0700

6.3.2

Programming Precautions

• Use the specified programming voltage and timing.

The programming voltage in PROM mode (VPP) is 12.5 V. Use of a higher voltage can

permanently damage the chip. Be especially careful with respect to PROM programmer

overshoot.

Setting the PROM programmer to Renesas (former Hitachi) specifications for the HN27C101

will result in correct VPP of 12.5 V.

• Make sure the index marks on the PROM programmer socket, socket adapter, and chip are

properly aligned. If they are not, the chip may be destroyed by excessive current flow. Before

programming, be sure that the chip is properly mounted in the PROM programmer.

• Avoid touching the socket adapter or chip while programming, since this may cause contact

faults and write errors.

• Take care when setting the programming mode, as page programming is not supported.

• When programming with a PROM programmer, be sure to specify addresses from H'0000 to

H'7FFF. If programming is inadvertently performed from H'8000 onward, it may not be

possible to continue PROM programming and verification. When programming, H'FF should

be set as the data in address area H'8000 to H'1FFFF.

H838024 Datasheet(PDF) 194 Page - Renesas Technology Corp