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38D5 Datasheet(PDF) 93 Page - Renesas Technology Corp |
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38D5 Datasheet(HTML) 93 Page - Renesas Technology Corp |
93 / 141 page Rev.3.01 Aug 08, 2007 Page 93 of 134 REJ03B0158-0301 38D5 Group NOTES ON QzROM VERSION Wiring to OSCSEL pin 1. OSCSEL = L Connect the OSCSEL pin the shortest possible to the GND pattern which is supplied to the VSS pin of the microcomputer. In addition connecting an approximately 5 k Ω resistor in series to the GND could improve noise immunity. In this case as well as the above mention, connect the pin the shortest possible to the GND pattern which is supplied to the VSS pin of the microcomputer. 2. OSCSEL = H Connect the OSCSEL pin the shortest possible to the VCC pattern which is supplied to the VCC pin of the microcomputer. In addition connecting an approximately 5 k Ω resistor in series to the VCC could improve noise immunity. In this case as well as the above mention, connect the pin the shortest possible to the VCC pattern which is supplied to the VCC pin of the microcomputer. •Reason The OSCSEL pin is the power source input pin for the built-in QzROM. When programming in the QzROM, the impedance of the OSCSEL pin is low to allow the electric current for writing to flow into the built-in QzROM. Because of this, noise can enter easily. If noise enters the OSCSEL pin, abnormal instruction codes or data are read from the QzROM, which may cause a program runaway. Fig. 87 Wiring for the OSCSEL pin Precautions Regarding Overvoltage in QzROM Version Make sure that voltage exceeding the VCC pin voltage is not applied to other pins. In particular, ensure that the state indicated by bold lines in figure below does not occur for OSCSEL pin (VPP power source pin for QzROM) during power-on or power- off. Otherwise the contents of QzROM could be rewritten. Fig. 88 Example of Overvoltage Product shipped in blank As for the product shipped in blank, Renesas does not perform the writing test to user ROM area after the assembly process though the QzROM writing test is performed enough before the assembly process. Therefore, a writing error of approximate 0.1% may occur. Moreover, please note the contact of cables and foreign bodies on a socket, etc. because a writing environment may cause some writing errors. Notes On QzROM Writing Orders When ordering the QzROM product shipped after writing, submit the mask file (extension: .msk) which is made by the mask file converter MM. Be sure to set the ROM option (“MASK option” written in the mask file converter) setup when making the mask file by using the mask file converter MM. Notes On ROM Code Protect (QzROM product shipped after writing) As for the QzROM product shipped after writing, the ROM code protect is specified according to the ROM option setup data in the mask file which is submitted at ordering. The ROM option setup data in the mask file is “0016” for protect enabled, “FE16” (protect enabled to the protect area 1 only) or “FF16” for protect disabled. Therefore, the contents of the ROM code protect address (the reserved ROM area) of the QzROM product shipped after writing is “0016”, “FE16” or “FF16”. Note that the mask file which has nothing at the ROM option data or has the data other than “0016”, “FE16” and “FF16” can not be accepted. Data Required For QzROM Writing Orders The following are necessary when ordering a QzROM product shipped after writing: 1. QzROM Writing Confirmation Form* 2. Mark Specification Form* 3. ROM data...........Mask file * For the QzROM writing confirmation form and the mark specification form, refer to the “Renesas Technology Corp.” Homepage (http://www.renesas.com/homepage.jsp). Note that we cannot deal with special font marking (customer's trademark etc.) in QzROM microcomputer. QzROM Receive Flow When writing to QzROM is performed by user side, the receiving inspection by the following flow is necessary. Fig. 89 QzROM receive flow OSCSEL VSS The shortest The shortest about 5 k Ω Termination of OSCSEL pin OSCSEL VCC The shortest The shortest about 5 k Ω (1) OSCSEL = L (2) OSCSEL = H (1) (1) (1) (1) Note 1: It shows the microcomputer’s pin VCC pin voltage OSCSEL pin voltage “H” input OSCSEL pin voltage “L” input 1.8V 1.8V (1) Input voltage to other MCU pins rises before VCC pin voltage. (2) Input voltage to other MCU pins falls after VCC pin voltage. Note: The internal circuitry is unstable when VCC is below the minimum voltage specification of 1.8 V (shaded portion), so particular care should be exercised regarding overvoltage. (1) (2) QzROM product shipped in blank Programming Verify test Receiving inspection of unprotected area (Verify test) Programming to unprotected area Verify test for unprotected area Shipping User QzROM product shipped after writing “protect disabled” “protect enabled to the protect area 1” Renesas Receiving inspection (Blank check) Programming Verify test for all area Shipping User Renesas |
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