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AT89C51ED2-RDTIM Datasheet(PDF) 114 Page - ATMEL Corporation |
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AT89C51ED2-RDTIM Datasheet(HTML) 114 Page - ATMEL Corporation |
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114 / 137 page  114 AT89C51RD2/ED2 4235E–8051–04/04 API Call Description The IAP allows to reprogram a microcontroller on-chip Flash memory without removing it from the system and while the embedded application is running. The user application can call some Application Programming Interface (API) routines allowing IAP. These API are executed by the bootloader. To call the corresponding API, the user must use a set of Flash_api routines which can be linked with the application. Example of Flash_api routines are available on the Atmel web site on the software appli- cation note: C Flash Drivers for the AT89C51RD2/ED2 The API calls description and arguments are shown in Table 76. Process The application selects an API by setting R1, ACC, DPTR0 and DPTR1 registers. All calls are made through a common interface “USER_CALL” at the address FFF0h. The jump at the USER_CALL must be done by LCALL instruction to be able to come- back in the application. Before jump at the USER_CALL, the bit ENBOOT in AUXR1 register must be set. Constraints The interrupts are not disabled by the bootloader. Interrupts must be disabled by user prior to jump to the USER_CALL, then re-enabled when returning. Interrupts must also be disabled before accessing EEPROM Data then re-enabled after. The user must take care of hardware watchdog before launching a Flash operation. Table 76. API Call Summary Command R1 A DPTR0 DPTR1 Returned Value Command Effect READ MANUF ID 00h XXh 0000h XXh ACC = Manufacturer Id Read Manufacturer identifier READ DEVICE ID1 00h XXh 0001h XXh ACC = Device Id 1 Read Device identifier 1 READ DEVICE ID2 00h XXh 0002h XXh ACC = Device Id 2 Read Device identifier 2 READ DEVICE ID3 00h XXh 0003h XXh ACC = Device Id 3 Read Device identifier 3 ERASE BLOCK 01h XXh DPH = 00h 00h ACC = DPH Erase block 0 DPH = 20h Erase block 1 DPH = 40h Erase block 2 Address of byte to program Program one Data Byte in user Flash XXh Erase Software boot vector and boot status byte. (SBV = FCh and BSB = FFh) |
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