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PIC16F-E/ML 数据表(PDF) 91 Page - Microchip Technology |
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PIC16F-E/ML 数据表(HTML) 91 Page - Microchip Technology |
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91 / 178 page  © 2007 Microchip Technology Inc. DS40044F-page 89 PIC16F627A/628A/648A 13.0 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 (SFRs). There are four SFRs used to read and write this memory. These registers are: • 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. PIC16F627A/628A devices have 128 bytes of data EEPROM with an address range from 0h to 7Fh. The PIC16F648A device has 256 bytes of data EEPROM with an address range from 0h to FFh. 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 device is code-protected, the CPU can continue to read and write the data EEPROM memory. A 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 13-1: EEDATA – EEPROM DATA REGISTER (ADDRESS: 9Ah) REGISTER 13-2: EEADR – EEPROM ADDRESS REGISTER (ADDRESS: 9Bh) R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x EEDAT7 EEDAT6 EEDAT5 EEDAT4 EEDAT3 EEDAT2 EEDAT1 EEDAT0 bit 7 bit 0 bit 7-0 EEDATn: Byte value to Write to or Read from data EEPROM memory location. 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 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x EADR7 EADR6 EADR5 EADR4 EADR3 EADR2 EADR1 EADR0 bit 7 bit 0 bit 7 PIC16F627A/628A Unimplemented Address: Must be set to ‘0’ PIC16F648A EEADR: Set to ‘1’ specifies top 128 locations (128-255) of EEPROM Read/Write Operation bit 6-0 EEADR: Specifies one of 128 locations of EEPROM Read/Write Operation 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 |
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