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PIC18F8620 Datasheet

  • PIC18F8620

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 380頁

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
7.3
Reading the Data EEPROM
Memory
control bit (EECON1<6>) and then set the RD control
bit (EECON1<0>). The data is available for the very
next instruction cycle; therefore, the EEDATA register
can be read by the next instruction. EEDATA will hold
this value until another read operation, or until it is
written to by the user (during a write operation).
To read a data memory location, the user must write the
address to the EEADRH:EEADR register pair, clear the
EEPGD control bit (EECON1<7>), clear the CFGS
EXAMPLE 7-1:
MOVLW
MOVWF
MOVLW
MOVWF
BCF
BCF
BSF
MOVF
DATA EEPROM READ
;
;
;
;
;
;
;
;
Upper bits of Data Memory Address to read
Lower bits of Data Memory Address to read
Point to DATA memory
Access EEPROM
EEPROM Read
W = EEDATA
DATA_EE_ADDRH
EEADRH
DATA_EE_ADDR
EEADR
EECON1, EEPGD
EECON1, CFGS
EECON1, RD
EEDATA, W
7.4
Writing to the Data EEPROM
Memory
should be kept clear at all times, except when updating
the EEPROM. The WREN bit is not cleared
by hardware
After a write sequence has been initiated, EECON1,
EEADRH, EEADR and EEDATA cannot be modified.
The WR bit will be inhibited from being set unless the
WREN bit is set. Both WR and WREN cannot be set
with the same instruction.
At the completion of the write cycle, the WR bit is
cleared in hardware and the EEPROM Write Complete
Interrupt Flag bit (EEIF) is set. The user may either
enable this interrupt, or poll this bit. EEIF must be
cleared by software.
To write an EEPROM data location, the address must
first be written to the EEADRH:EEADR register pair
and the data written to the EEDATA register. Then the
sequence in Example 7-2 must be followed to initiate
the write cycle.
The write will not initiate if the above sequence is not
exactly followed (write 55h to EECON2, write AAh to
EECON2, then set WR bit) for each byte. It is strongly
recommended that interrupts be disabled during this
code segment.
Additionally, the WREN bit in EECON1 must be set to
enable writes. This mechanism prevents accidental
writes to data EEPROM due to unexpected code
execution (i.e., runaway programs). The WREN bit
EXAMPLE 7-2:
DATA EEPROM WRITE
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
BCF
BCF
BSF
BCF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
BSF
DATA_EE_ADDRH
EEADRH
DATA_EE_ADDR
EEADR
DATA_EE_DATA
EEDATA
EECON1, EEPGD
EECON1, CFGS
EECON1, WREN
INTCON, GIE
55h
EECON2
AAh
EECON2
EECON1, WR
INTCON, GIE
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
Upper bits of Data Memory Address to write
Lower bits of Data Memory Address to write
Data Memory Value to write
Point to DATA memory
Access EEPROM
Enable writes
Disable Interrupts
Write 55h
Write AAh
Set WR bit to begin write
Enable Interrupts
Required
Sequence
BCF
EECON1, WREN
; User code execution
; Disable writes on write complete (EEIF set)
錚?/div>
2004 Microchip Technology Inc.
DS39609B-page 81

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