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PIC12F675T-E/P 数据表(PDF) 49 Page - Microchip Technology |
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PIC12F675T-E/P 数据表(HTML) 49 Page - Microchip Technology |
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49 / 136 page  2010 Microchip Technology Inc. DS41190G-page 49 PIC12F629/675 8.0 DATA EEPROM MEMORY The EEPROM data memory is readable and writable during normal operation (full VDD range). This memory is not directly mapped in the register file space. Instead, it is indirectly addressed through the Special Function Registers. There are four SFRs used to read and write this memory: • EECON1 • EECON2 (not a physically implemented register) • EEDATA • EEADR EEDATA holds the 8-bit data for read/write, and EEADR holds the address of the EEPROM location being accessed. PIC12F629/675 devices have 128 bytes of data EEPROM with an address range from 0h to 7Fh. The EEPROM data memory allows byte read and write. A byte write automatically erases the location and writes the new data (erase before write). The EEPROM data memory is rated for high erase/write cycles. The write time is controlled by an on-chip timer. The write time will vary with voltage and temperature as well as from chip to chip. Please refer to AC Specifications for exact limits. When the data memory is code-protected, the CPU may continue to read and write the data EEPROM memory. The device programmer can no longer access this memory. Additional information on the data EEPROM is available in the PIC® Mid-Range Reference Manual, (DS33023). REGISTER 8-1: EEDAT: EEPROM DATA REGISTER (ADDRESS: 9Ah) REGISTER 8-2: EEADR: EEPROM ADDRESS REGISTER (ADDRESS: 9Bh) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 EEDAT7 EEDAT6 EEDAT5 EEDAT4 EEDAT3 EEDAT2 EEDAT1 EEDAT0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 EEDATn: Byte value to write to or read from data EEPROM U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — EADR6 EADR5 EADR4 EADR3 EADR2 EADR1 EADR0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7 Unimplemented: Should be set to ‘0’ bit 6-0 EEADR: Specifies one of 128 locations for EEPROM Read/Write Operation |
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