PIC18F252-I/SO Microchip Technology Inc., PIC18F252-I/SO Datasheet - Page 61
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PIC18F252-I/SO
Manufacturer Part Number
PIC18F252-I/SO
Description
Microcontroller; 32 KB Flash; 1536 RAM; 256 EEPROM; 25 I/O; 28-Pin-SOIC
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F252-ISO.pdf
(332 pages)
Specifications of PIC18F252-I/SO
A/d Inputs
5-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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5.3
The TBLRD instruction is used to retrieve data from pro-
gram memory and place into data RAM. Table Reads
from program memory are performed one byte at a
time.
FIGURE 5-4:
EXAMPLE 5-1:
© 2006 Microchip Technology Inc.
READ_WORD
Reading the FLASH Program
Memory
Instruction Register
MOVLW CODE_ADDR_UPPER
MOVWF TBLPTRU
MOVLW CODE_ADDR_HIGH
MOVWF TBLPTRH
MOVLW CODE_ADDR_LOW
MOVWF TBLPTRL
TBLRD*+
MOVF TABLAT, W
MOVWF WORD_EVEN
TBLRD*+
MOVF TABLAT, W
MOVWF WORD_ODD
(IR)
READS FROM FLASH PROGRAM MEMORY
READING A FLASH PROGRAM MEMORY WORD
(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)
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.
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 5-4
shows the interface between the internal program
memory and the TABLAT.
TBLPTR = xxxxx1
TBLRD
Read Register
PIC18FXX2
TABLAT
TBLPTR = xxxxx0
DS39564C-page 59
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