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SST89E58RD2-40-C-TQJ Datasheet(PDF) 34 Page - Silicon Storage Technology, Inc |
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SST89E58RD2-40-C-TQJ Datasheet(HTML) 34 Page - Silicon Storage Technology, Inc |
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34 / 81 page  34 Data Sheet FlashFlex51 MCU SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD ©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06 4.0 FLASH MEMORY PROGRAMMING The device internal flash memory can be programmed or erased using the In-Application Programming (IAP) mode. 4.1 Product Identification The Read-ID command accesses the Signature Bytes that identify the device and the manufacturer as SST. External programmers primarily use these Signature Bytes in the selection of programming algorithms. 4.2 In-Application Programming Mode The device offers either 16/24/40 KByte of in-application programmable flash memory. During in-application pro- gramming, the CPU of the microcontroller enters IAP mode. The two blocks of flash memory allow the CPU to execute user code from one block, while the other is being erased or reprogrammed concurrently. The CPU may also fetch code from an external memory while all internal flash is being reprogrammed. The mailbox registers (SFST, SFCM, SFAL, SFAH, SFDT and SFCF) located in the spe- cial function register (SFR), control and monitor the device’s erase and program process. Table 4-2 outline the commands and their associated mail- box register settings. 4.2.1 In-Application Programming Mode Clock Source During IAP mode, both the CPU core and the flash control- ler unit are driven off the external clock. However, an inter- nal oscillator will provide timing references for Program and Erase operations. The internal oscillator is only turned on when required, and is turned off as soon as the flash oper- ation is completed. 4.2.2 Memory Bank Selection for In-Application Programming Mode With the addressing range limited to 16 bit, only 64 KByte of program address space is “visible” at any one time. The bank selection (the configuration of EA# and SFCF[1:0]), allows Block 1 memory to be overlaid on the lowest 8 KByte of Block 0 memory, making Block 1 reachable. The same concept is employed to allow both Block 0 and Block 1 flash to be accessible to IAP operations. Code from a block that is not visible may not be used as a source to pro- gram another address. However, a block that is not “visible” may be programmed by code from the other block through mailbox registers. The device allows IAP code in one block of memory to pro- gram the other block of memory, but may not program any location in the same block. If an IAP operation originates physically from Block 0, the target of this operation is implic- itly defined to be in Block 1. If the IAP operation originates physically from Block 1, then the target address is implicitly defined to be in Block 0. If the IAP operation originates from external program space, then, the target will depend on the address and the state of bank selection. 4.2.3 IAP Enable Bit The IAP enable bit, SFCF[6], enables in-application pro- gramming mode. Until this bit is set, all flash programming IAP commands will be ignored. 4.2.4 In-Application Programming Mode Commands All of the following commands can only be initiated in the IAP mode. In all situations, writing the control byte to the SFCM register will initiate all of the operations. All com- mands will not be enabled if the security locks are enabled on the selected memory block. The Program command is for programming new data into the memory array. The portion of the memory array to be programmed should be in the erased state, FFH. If the memory is not erased, it should first be erased with an appropriate Erase command. Warning: Do not attempt to write (program or erase) to a block that the code is cur- rently fetching from. This will cause unpredictable pro- gram behavior and may corrupt program data. TABLE 4-1: Product Identification Address Data Manufacturer’s ID 30H BFH Device ID SST89E52RD2/RD 31H 9DH SST89V52RD2/RD 31H 9CH SST89E54RD2/RD 31H 9FH SST89V54RD2/RD 31H 9EH SST89E58RD2/RD 31H 9BH SST89V58RD2/RD 31H 9AH T4-1.2 1255 |
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