PIC18C242/JW Microchip Technology, PIC18C242/JW Datasheet - Page 227

• Manufacturer Part Number: PIC18C242/JW
• Description: IC MCU EPROM 8KX16 A/D 28CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242/JW

• 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: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: EPROM, UV
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

TBLRD
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
2001 Microchip Technology Inc.
operation
Decode
No
Q1
operation
operation
Memory)
Table Read
[ label ]
None
if TBLRD *,
if TBLRD *+,
if TBLRD *-,
if TBLRD +*,
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
Program
(Read
No
No
Q2
0000
(Prog Mem (TBLPTR))
TBLPTR - No Change;
(Prog Mem (TBLPTR))
(TBLPTR) +1
(Prog Mem (TBLPTR))
(TBLPTR) -1
(TBLPTR) +1
(Prog Mem (TBLPTR))
TBLPTR[0] = 0: Least Significant
Byte of Program Memory Word
TBLPTR[0] = 1: Most Significant
Byte of Program Memory Word
TBLRD ( *; *+; *-; +*)
operation
operation
0000
No
No
Q3
TBLPTR;
TBLPTR;
TBLPTR;
0000
operation
operation
TABLAT)
(Write
No
No
Q4
TABLAT;
TABLAT;
TABLAT;
TABLAT;
nn=0 *
10nn
=1 *+
=2 *-
=3 +*
TBLRD
Example 1:
Example 2:
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
PIC18CXX2
*+ ;
+* ;
=
=
=
=
=
=
=
=
=
=
=
DS39026C-page 225
0x55
0x00A356
0x34
0x34
0x00A357
0xAA
0x01A357
0x12
0x34
0x34
0x01A358