PIC18F2510 MICROCHIP [Microchip Technology], PIC18F2510 Datasheet - Page 297
PIC18F2510
Manufacturer Part Number
PIC18F2510
Description
28/40/44-PIN FLASH MICROCONTROLLERS WITH 10-BIT A/D AND NANO WATT TECHNOLOGY
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2510.pdf
(380 pages)
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TBLRD
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
Words:
Cycles:
2004 Microchip Technology Inc.
Q Cycle Activity:
operation
Decode
No
Q1
(Read Program
None
(Prog Mem (TBLPTR))
TBLPTR – No Change;
if TBLRD *+,
(Prog Mem (TBLPTR))
(TBLPTR) + 1
if TBLRD *-,
(Prog Mem (TBLPTR))
(TBLPTR) – 1
if TBLRD +*,
(TBLPTR) + 1
(Prog Mem (TBLPTR))
This instruction is used to read the contents
of Program Memory (P.M.). To address the
program memory, a pointer called Table
Pointer (TBLPTR) is used.
The TBLPTR (a 21-bit pointer) points to
each byte in the program memory. TBLPTR
has a 2-Mbyte address range.
The TBLRD instruction can modify the value
of TBLPTR as follows:
• no change
• post-increment
• post-decrement
• pre-increment
1
2
Table Read
TBLRD ( *; *+; *-; +*)
if TBLRD *,
No operation
operation
Memory)
0000
TBLPTR[0] = 0:
TBLPTR[0] = 1:
No
Q2
0000
operation
operation
TBLPTR;
TBLPTR;
TBLPTR;
No
No
Q3
Least Significant Byte
of Program Memory
Word
Most Significant Byte
of Program Memory
Word
0000
TABLAT;
TABLAT;
TABLAT;
TABLAT;
(Write TABLAT)
No operation
operation
nn=0 *
No
Q4
10nn
=1 *+
=2 *-
=3 +*
Preliminary
TBLRD
Example 1:
Example 2:
Before Instruction
After Instruction
Before Instruction
After Instruction
PIC18F2X1X/4X1X
TABLAT
TBLPTR
MEMORY (00A356h)
TABLAT
TBLPTR
TABLAT
TBLPTR
MEMORY (01A357h)
MEMORY (01A358h)
TABLAT
TBLPTR
Table Read (Continued)
TBLRD
TBLRD
*+ ;
+* ;
=
=
=
=
=
=
=
=
=
=
=
DS39636A-page 295
55h
00A356h
34h
00A357h
AAh
01A357h
34h
01A358h
34h
12h
34h
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