PIC18F6621-I/PT Microchip Technology Inc., PIC18F6621-I/PT Datasheet - Page 316

• Manufacturer Part Number: PIC18F6621-I/PT
• Description: 64 PIN, 64 KB FLASH, 3840 RAM, 52 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F6621-I/PT

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 1024 Bytes
• Input Output: 54
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 64-pin TQFP
• Programmable Memory: 64K Bytes
• Ram Size: 3.8K Bytes
• Speed: 40 MHz
• Timers: 2-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18F6525/6621/8525/8621
TBLWT
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
DS39612B-page 314
This instruction uses the 3 LSBs of TBLPTR
Table Write
[ label ]
None
if TBLWT*
(TABLAT) → Holding Register;
TBLPTR – No Change
if TBLWT*+
(TABLAT) → Holding Register;
(TBLPTR) + 1 → TBLPTR
if TBLWT*-
(TABLAT) → Holding Register;
(TBLPTR) – 1 → TBLPTR
if TBLWT+*
(TBLPTR) + 1 → TBLPTR;
(TABLAT) → Holding Register
to determine which of the 8 holding registers
the TABLAT is written to. The holding
registers are used to program the contents
of Program Memory (P.M.). (Refer to
Section 5.0 “Flash Program Memory” for
additional details on programming Flash
memory.)
The TBLPTR (a 21-bit pointer) points to
each byte in the program memory. TBLPTR
has a 2-MByte address range. The LSB of
the TBLPTR selects which byte of the
program memory location to access.
The TBLWT instruction can modify the
value of TBLPTR as follows:
• no change
• post-increment
• post-decrement
• pre-increment
TBLPTR[0] = 0: Least Significant Byte of
TBLPTR[0] = 1: Most Significant Byte of
0000
TBLWT ( *; *+; *-; +*)
0000
Program Memory Word
Program Memory Word
0000
nn=0 *
=1 *+
=2 *-
=3 +*
11nn
TBLWT
Words:
Cycles: 2
Q Cycle Activity:
Example 1:
Example 2:
Before Instruction
After Instructions (table write completion)
Before Instruction
After Instruction (table write completion)
1
TABLAT
TBLPTR
HOLDING REGISTER
(0x00A356)
TABLAT
TBLPTR
HOLDING REGISTER
(0x00A356)
TABLAT
TBLPTR
HOLDING REGISTER
(0x01389A)
HOLDING REGISTER
(0x01389B)
TABLAT
TBLPTR
HOLDING REGISTER
(0x01389A)
HOLDING REGISTER
(0x01389B)
operation
Decode
Q1
No
Table Write (Continued)
TBLWT
TBLWT
operation
operation
TABLAT)
(Read
 2005 Microchip Technology Inc.
Q2
No
No
*+;
+*;
=
=
=
=
=
=
=
=
=
=
=
=
=
=
operation
operation
Q3
No
No
0x55
0x00A356
0xFF
0x55
0x00A357
0x55
0x34
0x01389A
0xFF
0xFF
0x34
0x01389B
0xFF
0x34
Register )
operation
operation
(Write to
Holding
Q4
No
No