PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 329
PIC18F4431-I/P
Manufacturer Part Number
PIC18F4431-I/P
Description
Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4431-IP.pdf
(396 pages)
Specifications of PIC18F4431-I/P
A/d Inputs
9-Channel, 10-Bit
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
16K Bytes
Ram Size
768 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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TBLWT
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
2003 Microchip Technology Inc.
Table Write
[ label ]
None
if TBLWT*,
(TABLAT)
TBLPTR - No Change;
if TBLWT*+,
(TABLAT)
(TBLPTR) +1
if TBLWT*-,
(TABLAT)
(TBLPTR) -1
if TBLWT+*,
(TBLPTR) +1
(TABLAT)
This instruction uses the 3 LSBs of
TBLPTR 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 6.0
“Flash Program Memory” for addi-
tional details on programming Flash
memory.)
The TBLPTR (a 21-bit pointer) points
to each byte in the program memory.
TBLPTR has a 2 MBtye 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
0000
TBLPTR[0] = 0:Least Significant
TBLPTR[0] = 1:Most Significant
TBLWT ( *; *+; *-; +*)
Holding Register;
Holding Register;
Holding Register;
0000
Holding Register;
TBLPTR;
TBLPTR;
TBLPTR;
Byte of Program
Memory Word
Byte of Program
Memory Word
0000
PIC18F2331/2431/4331/4431
nn=0 *
11nn
=1 *+
=2 *-
=3 +*
Preliminary
TBLWT Table Write (Continued)
Words: 1
Cycles: 2
Q Cycle Activity:
Example1:
Example 2:
Before Instruction
After Instructions (table write completion)
Before Instruction
After Instruction (table write completion)
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
TBLWT
TBLWT
operation
operation
TABLAT)
(Read
Q2
No
No
*+;
+*;
=
=
=
=
=
=
=
=
=
=
=
=
=
=
operation
operation
DS39616B-page 327
0x55
0x00A356
0xFF
0x55
0x00A357
0x55
0x34
0x01389A
0xFF
0xFF
0x34
0x01389B
0xFF
0x34
Q3
No
No
Register )
operation
operation
(Write to
Holding
Q4
No
No
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