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T89C51RD2-3CWC-M Datasheet(PDF) 64 Page - ATMEL Corporation |
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T89C51RD2-3CWC-M Datasheet(HTML) 64 Page - ATMEL Corporation |
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64 / 86 page  Rev. F - 15 February, 2001 64 T89C51RD2 Note: These functions can only be called by user’s code. The standard boot loader cannot decrease the security level. 8.9. FLASH Parallel Programming 8.9.1. Signature bytes Four hardware read only registers have to be accessed with parallel static test modes (mode TMS) in order to control the FLASH parallel programmimg: • Manufacturer code • Device ID # 1: Family code • Device ID # 2: Memories size and type • Device ID # 3: Name and revision As these registers can only be accessed by hardware, they must be read by the parallel programmers and then copied in the XAF in order to make their values accessible by software (ISP or API). 8.9.2. Set-up modes In order to program and verify the FLASH or to read the signature bytes, the T89C51RD2 is placed in specific set-up modes (See Figure 22). Control and program signals must be held at the levels indicated in Table 37. and Table 38.(Please notice that each mode is defined over the two tables |
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