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HD6433644R Datasheet(PDF) 129 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 129 Page - Renesas Technology Corp

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Section 6 ROM
Rev. 6.00 Sep 12, 2006 page 109 of 526
REJ09B0326-0600
Figure 6.4 shows a PROM write/verify timing diagram.
Address
Data
VPP
VCC
CE
OE
VPP
VCC
VCC
VCC
Write
Verify
Input data
Output data
tAS
tDS
tVPS
tVCS
tPW
tOPW*
tDH
tOES
tOE
tDF
tAH
Note: * tOPW is defined by the value given in figure 6.3, High-Speed, High-Reliability Programming
Flow Chart.
+1
Figure 6.4 PROM Write/Verify Timing
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 Technology specifications for the HN27C256 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.



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