AC162078 Microchip Technology, AC162078 Datasheet - Page 75
AC162078
Manufacturer Part Number
AC162078
Description
HEADER INTRFC MPLAB ICD2 18F1330
Manufacturer
Microchip Technology
Datasheet
1.AC162078.pdf
(318 pages)
Specifications of AC162078
Accessory Type
Transition Header
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
ICD2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
Available stocks
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Part Number:
AC162078
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MICROCHIP
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7.3
The TBLRD instruction is used to retrieve data from
program memory and places it into data RAM. Table
reads from program memory are performed one byte at
a time.
TBLPTR points to a byte address in program space.
Executing TBLRD places the byte pointed to into
TABLAT. In addition, TBLPTR can be modified
automatically for the next table read operation.
FIGURE 7-4:
EXAMPLE 7-1:
2009 Microchip Technology Inc.
READ_WORD
Instruction Register
Reading the Flash Program
Memory
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
TBLRD*+
MOVF
MOVWF
TBLRD*+
MOVF
MOVWF
(IR)
READS FROM FLASH PROGRAM MEMORY
READING A FLASH PROGRAM MEMORY WORD
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
TABLAT, W
WORD_EVEN
TABLAT, W
WORD_ODD
(Even Byte Address)
FETCH
Program Memory
; Load TBLPTR with the base
; address of the word
; read into TABLAT and increment
; get data
; read into TABLAT and increment
; get data
(Odd Byte Address)
The internal program memory is typically organized by
words. The Least Significant bit of the address selects
between the high and low bytes of the word. Figure 7-4
shows the interface between the internal program
memory and the TABLAT.
TBLPTR = xxxxx1
TBLRD
PIC18F1230/1330
Read Register
TABLAT
TBLPTR = xxxxx0
DS39758D-page 75
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