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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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L9805 Datenblatt(PDF) 83 Page - STMicroelectronics |
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L9805 Datenblatt(HTML) 83 Page - STMicroelectronics |
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83 / 103 page  83/103 L9805 5.9.2 Functional description 5.9.2.1 Read operation (E2LAT=0) The EEPROM can be read as a normal ROM/RAM location when the E2LAT bit of the CR register is cleared. The address decoder selects the desired byte. The 8 sense amplifiers evaluate the stored byte which is put on the data bus. 5.9.2.2 Write operation (E2LAT=1) The EEPROM programming flowchart is shown in Figure 45. To access the write mode, E2LAT bit must be set. Then when a write access to the EEPROM occurs, the value on the data bus is latched on the 8 data latches depending on the address. To program the memory, the E2PGM bit must be set, so the pro- gramming cycle starts. At the end of the cycle, the E2PGM bit and E2LAT bit are cleared, and an in- terrupt could be generated id E2ITE is set. 5.9.2.3 Wait mode The EEPROM can enter the wait mode by execut- ing the wait instruction of the micro-controller. The EEPROM will effectively enter this mode if there is no programming in progress, in such a case the EEPROM will finish the cycle and then enter this low consumption mode. 5.9.2.4 Halt mode The EEPROM enters the halt mode if the micro- controller did execute the halt instruction. The EEPROM will stop the function in progress, and will enter in this low consumption mode. Figure 44. EEPROM Programming Cycle Erase cycle Write cycle Tprog Read operation allowed Read operation not possible INTERNAL PROGRAMMING VOLTAGE Write of data latches E2LAT E2PGM INTERRUPT REQUEST Interrupt vector fetch |
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