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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M16C/29 датащи(PDF) 359 Page - Renesas Technology Corp |
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M16C/29 датащи(HTML) 359 Page - Renesas Technology Corp |
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359 / 499 page  20. Flash Memory Version p u o r G 9 2 / C 6 1 M page 335 8 5 4 f o 7 0 0 2 , 0 3 .r a M 2 1 . 1 . v e R 2 1 1 0 - 1 0 1 0 B 9 0 J E R 20.3 Functions To Prevent Flash Memory from Rewriting The flash memory has a built-in ROM code protect function for parallel I/O mode and a built-in ID code check function for standard input/output mode to prevent the flash memory from reading or rewriting. 20.3.1 ROM Code Protect Function The ROM code protect function disables reading or changing the contents of the on-chip flash memory in parallel I/O mode. Figure 20.4 shows the ROMCP address. The ROMCP address is located in a user ROM area. To enable ROM code protect, set the ROMCP1 bit to “002”, “012”, or “102” and set the bit 5 to bit 0 to “1111112”. To cancel ROM code protect, erase the block including the the ROMCP register in CPU rewrite mode or standard serial I/O mode. 20.3.2 ID Code Check Function Use the ID code check function in standard serial input/output mode. Unless the flash memory is blank, the ID code sent from the programmer and the 7-byte ID code written in the flash memory are compared for match. If the ID codes do not match, the commands sent from the programmer are not acknowledged. The ID code consists of 8-bit data, starting with the first byte, into addresses, 0FFFDF16, 0FFFE316, 0FFFEB16, 0FFFEF16, 0FFFF316, 0FFFF716, and 0FFFFB16. The flash memory must have a program with the ID code set in these addresses. |
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