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TMP86FM25F Datasheet(PDF) 6 Page - Toshiba Semiconductor |
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TMP86FM25F Datasheet(HTML) 6 Page - Toshiba Semiconductor |
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6 / 53 page  TMP86FM25 2004-03-01 86FM25-5 Under development 1.1 FLASH Memory 1.1.1 Outline The TMP86FM25 incorporates 32768 bytes of FLASH memory (Address 8000H to FFFFH). The writing to FLASH is controlled by FLASH control register (EEPCR), FLASH status register (EEPSR). To write data to the FLASH, execute the Serial PROM mode. For details about the Serial PROM mode, refer to “2.1 Serial PROM Mode”. The FLASH memory of the TMP86FM25 features: • The FLASH memory is constructed of 512 pages FLASH memory and one page size is 64 bytes (512 pages × 64 bytes = 32768 bytes). • The TMP86FM25 incorporates a 64-byte temporary data buffer. The data written to FLASH memory is temporarily stored in this data buffer. After 64 bytes data have been written to the temporary data buffer, the writing to FLASH memory automatically starts by page writing (The 64 bytes data are written to specified page of FLASH simultaneously). At the same time, page-by-page erasing occurs automatically. So, it is unnecessary to erase individual pages in advance. • The FLASH control circuit incorporates an oscillator dedicated to the FLASH. So FLASH writing time is independent of the system clock frequency (fc). In addition, because an FLASH control circuit controls writing time for each FLASH memory cell, the writing time varies in each page (Typically 4 ms per page). • Controlling the power for the FLASH control circuit (Regulator and voltage step-up circuit) achieves low power consumption if the FLASH is not in use (Example: When the program is executed in RAM area). 1.1.2 Conditions for Accessing the FLASH Areas The conditions for accessing the FLASH areas vary depending on each operation mode. The following tables shows FLASH are access conditions. Table 1.1.1 FLASH Area Access Conditions Operation Mode Area MCU Mode (Note 1) Serial PROM Mode (Note 2) FLASH memory 8000H to FFFFH Read/Fetch only Write/Read/Fetch supported Note 1: “MCU Mode” shows NORMAL1/2 and SLOW1/2 modes. Note 2: “Serial PROM Mode” shows the FLASH controlling mode. For details, refer to 2.1 “Serial PROM Mode”. Note 3: “Fetch” means reading operation of FLASH data as an instruction by CPU. |
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