PIC18F452-I/LG Microchip Technology, PIC18F452-I/LG Datasheet - Page 251

• Manufacturer Part Number: PIC18F452-I/LG
• Description: IC MCU FLASH 16KX16 W/AD 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F452-I/LG

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• For Use With: XLT44L2 - SOCKET TRAN ICE 44PLCCDVA16XL441 - ADAPTER DEVICE ICE 44PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TBLRD
Syntax:
Operands:
Operation:
Status Affected:None
Encoding:
Description:
Words:
Cycles:
© 2006 Microchip Technology Inc.
Q Cycle Activity:
operation
Decode
No
Q1
(Read Program
[ label ]
None
if TBLRD *,
(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 con-
tents 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
No operation
operation
Memory)
0000
TBLPTR[0] = 0: Least Significant
TBLPTR[0] = 1: Most Significant
No
Q2
TBLRD ( *; *+; *-; +*)
0000
operation
operation
TBLPTR;
TBLPTR;
TBLPTR;
No
No
Q3
Byte of Program
Memory Word
Byte of Program
Memory Word
0000
(Write TABLAT)
TABLAT;
TABLAT;
TABLAT;
TABLAT;
No operation
operation
nn=0 *
No
Q4
10nn
=1 *+
=2 *-
=3 +*
TBLRD
Example1:
Example2:
Before Instruction
After Instruction
Before Instruction
After Instruction
TABLAT
TBLPTR
MEMORY(0x00A356)
TABLAT
TBLPTR
TABLAT
TBLPTR
MEMORY(0x01A357)
MEMORY(0x01A358)
TABLAT
TBLPTR
Table Read (cont’d)
TBLRD
TBLRD
PIC18FXX2
*+ ;
+* ;
=
=
=
=
=
=
=
=
=
=
=
DS39564C-page 249
0x55
0x00A356
0x34
0x34
0x00A357
0xAA
0x01A357
0x12
0x34
0x34
0x01A358