Precaution when Shifting to ROM-Read Modes
Contents
1. Date May 24 2012 RENESAS TECHNICAL UPDATE 1753 Shimonumabe Nakahara ku Kawasaki shi Kanagawa 211 8668 Japan Renesas Electronics Corporation Product MPU MCU Document Category No TN RX A020A E Rev 1 00 Information Technical Notification Category Title Precaution when Shifting to ROM Read Modes Lot No Applicable Reference Product RA mamiy All lots Document Refer to the table below Thank you for your valued patronage and best wishes for your continued success in business We would like to inform you of a required precaution when shifting to ROM read modes and corrections to errors in the hardware manuals Precaution After writing to the flash P E mode entry register FENTRYR with the intention of placing the ROM or data flash memory in ROM read modes read the register to check that the specified value has actually been set Only start reading the ROM after confirming this Correction to Errors in the Hardware Manuals A note on the above precaution is to be added to the hardware manuals listed in the table of related documents The contents of the corrections are described using the text for the RX610 Group as a representative example 1 In section 26 ROM Flash Memory for Code Storage of the RX610 Group User s Manual Hardware the description of the register in section 26 2 8 Flash P E Mode Entry Register FENTRYR has been revised The revision is indicated by the2. LGLERR 0 ERSERR 0 PRGERR 0 FRESETR FRESET Write 10h to FASTAT 0 writing Issue a status register clear command Write AAOOh to FENTRYR He Read FENTRYR Write 02h to FWEPROR Note tE128K Erasure time for a 128 Kbyte erasure block see section 29 Electrical Characteristics tRESW2 Reset pulse width during programming erasure see section 29 Electrical Characteristics RENES Page 2 of 3 a AS RENESAS TECHNICAL UPDATE TN RX A020A E Applicable Products and Related Documents Date May 24 2012 Family Group Related Documents Control Code Section No for the ROM RX RX610 RX610 Group User s Manual Hardware RO1UH0032EJ0110 26 RX62N RX621 RX62N Group RX621 Group User s Manual Hardware RO1UH0033EJ0130 38 RX62T RX62T Group User s Manual Hardware RO1UH0034EJ0130 31 RX62G RX62G Group User s Manual Hardware RO1UH0321EJ0100 31 RENESAS Page 3 of 3
3. red letters below FENTRYR is a register to place the ROM data flash in P E mode To place the ROM data flash in P E mode so that the FCU can accept commands one of the FENTRYD FENTRY1 and FENTRYO bits must be set to 1 Note that if more than one of these bits is set to 1 the ILGLERR bit in FSTATRO is set and the FCU enters the command locked state After writing to FENTRYR to place the ROM or data flash memory in ROM read modes read the register to check that the new value has actually been set Only proceed with ROM reading after that Only specific values written to the upper byte in word access are valid Any other writing causes the register to be initialized Data written to the upper byte is not retained When on chip ROM is disabled the data read from FENTRYR is 0000h and writing is disabled FENTRYR is initialized by a reset or when the FRESET bit in FRESETR is set to 1 c 2012 Renesas Electronics Corporation All rights reserved Page 1 of 3 ztENESAS RENESAS TECHNICAL UPDATE TN RX A020A E Date May 24 2012 2 In section 26 ROM Flash Memory for Code Storage of the RX610 Group User s Manual Hardware the flowchart in Figure 26 7 Procedure for Transition to ROM Read Mode has been revised The revision is indicated in the red frame below FRDY bit check ILGLERR ERSERR or PRGERR 1 Timeout tE128K Yes Ecu ILGLERR bit initialization FRESETR FRESET Read FASTAT 1 writing check I
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