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38K2 Datasheet(PDF) 292 Page - Renesas Technology Corp |
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38K2 Datasheet(HTML) 292 Page - Renesas Technology Corp |
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292 / 358 page  3.2 Notes on use Rev.2.00 Oct 15, 2006 page 31 of 99 38K2 Group REJ09B0338-0200 APPENDIX 3.2.14 Notes on flash memory version The CNVss pin is connected to the internal memory circuit block by a low-ohmic resistance, since it has the multiplexed function to be a programmable power source pin (VPP pin) as well. To improve the noise reduction, connect a track between CNVss pin and Vss pin or Vcc pin with 1 to 10 k Ω resistance. The mask ROM version track of CNVss pin has no operational interference even if it is connected to Vss pin or Vcc pin via a resistor. 3.2.15 Electric Characteristic Differences Between Mask ROM and Flash Memory Version MCUs There are differences in electric characteristics, operation margin, noise immunity, and noise radiation between Mask ROM and Flash Memory version MCUs due to the difference in the manufacturing processes. When manufacturing an application system with the Flash Memory version and then switching to use of the Mask ROM version, please perform sufficient evaluations for the commercial samples of the Mask ROM version. |
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