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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC876 데이터시트(PDF) 48 Page - Microchip Technology |
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PIC876 데이터시트(HTML) 48 Page - Microchip Technology |
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48 / 218 page  PIC16F87X DS30292C-page 46 2001 Microchip Technology Inc. 4.9 FLASH Program Memory Write Protection The configuration word contains a bit that write protects the FLASH program memory, called WRT. This bit can only be accessed when programming the PIC16F87X device via ICSP. Once write protection is enabled, only an erase of the entire device will disable it. When enabled, write protection prevents any writes to FLASH program memory. Write protection does not affect pro- gram memory reads. TABLE 4-1: READ/WRITE STATE OF INTERNAL FLASH PROGRAM MEMORY TABLE 4-2: REGISTERS ASSOCIATED WITH DATA EEPROM/PROGRAM FLASH Configuration Bits Memory Location Internal Read Internal Write ICSP Read ICSP Write CP1 CP0 WRT 00 x All program memory Yes No No No 01 0 Unprotected areas Yes No Yes No 01 0 Protected areas Yes No No No 01 1 Unprotected areas Yes Yes Yes No 01 1 Protected areas Yes No No No 10 0 Unprotected areas Yes No Yes No 10 0 Protected areas Yes No No No 10 1 Unprotected areas Yes Yes Yes No 10 1 Protected areas Yes No No No 11 0 All program memory Yes No Yes Yes 11 1 All program memory Yes Yes Yes Yes Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on: POR, BOR Value on all other RESETS 0Bh, 8Bh, 10Bh, 18Bh INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000u 10Dh EEADR EEPROM Address Register, Low Byte xxxx xxxx uuuu uuuu 10Fh EEADRH — — — EEPROM Address, High Byte xxxx xxxx uuuu uuuu 10Ch EEDATA EEPROM Data Register, Low Byte xxxx xxxx uuuu uuuu 10Eh EEDATH — — EEPROM Data Register, High Byte xxxx xxxx uuuu uuuu 18Ch EECON1 EEPGD — — — WRERR WREN WR RD x--- x000 x--- u000 18Dh EECON2 EEPROM Control Register2 (not a physical register) —— 8Dh PIE2 — (1) — EEIE BCLIE — — CCP2IE -r-0 0--0 -r-0 0--0 0Dh PIR2 — (1) — EEIF BCLIF — — CCP2IF -r-0 0--0 -r-0 0--0 Legend: x = unknown, u = unchanged, r = reserved, - = unimplemented, read as '0'. Shaded cells are not used during FLASH/EEPROM access. Note 1: These bits are reserved; always maintain these bits clear. |
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