PIC18F6490-E/PT Microchip Technology, PIC18F6490-E/PT Datasheet - Page 90
![IC PIC MCU FLASH 16KX16 64TQFP](/photos/6/81/68123/c04-066_pf_sml.jpg)
PIC18F6490-E/PT
Manufacturer Part Number
PIC18F6490-E/PT
Description
IC PIC MCU FLASH 16KX16 64TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F6310-IPT.pdf
(28 pages)
3.PIC18F6390-IPT.pdf
(414 pages)
4.PIC18F6390-IPT.pdf
(16 pages)
5.PIC18F6390-IPT.pdf
(12 pages)
6.PIC18F6390-IPT.pdf
(6 pages)
7.PIC18F6390-IPT.pdf
(4 pages)
Specifications of PIC18F6490-E/PT
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, LCD, POR, PWM, WDT
Number Of I /o
50
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
64-TFQFP
For Use With
DM163028 - BOARD DEMO PICDEM LCD
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F6490-E/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC18F6310-IPT PDF datasheet #2
- PIC18F6390-IPT PDF datasheet #3
- PIC18F6390-IPT PDF datasheet #4
- PIC18F6390-IPT PDF datasheet #5
- PIC18F6390-IPT PDF datasheet #6
- PIC18F6390-IPT PDF datasheet #7
- Current page: 90 of 414
- Download datasheet (7Mb)
PIC18F6390/6490/8390/8490
6.2
Two control registers are used in conjunction with the
TBLRD instruction: the TABLAT register and the
TBLPTR register set.
6.2.1
The Table Latch (TABLAT) is an 8-bit register mapped
into the SFR space. The Table Latch register is used to
hold 8-bit data during data transfers between program
memory and data RAM.
6.2.2
The Table Pointer register (TBLPTR) addresses a byte
within the program memory. It is comprised of three
SFR registers: Table Pointer Upper Byte, Table Pointer
High
(TBLPTRU:TBLPTRH:TBLPTRL). Only the lower six
bits of TBLPTRU are used with TBLPTRH and
TBLPTRL to form a 22-bit wide pointer.
The contents of TBLPTR indicates a location in
program memory space. The low-order 21 bits allow
the device to address the full 2 Mbytes of program
memory space. The 22nd bit allows access to the
configuration space, including the device ID, user ID
locations and the Configuration bits.
The TBLPTR register set is updated when executing a
TBLRD in one of four ways, based on the instruction’s
arguments. These are detailed in Table 6-1. These
operations on the TBLPTR only affect the low-order
21 bits.
When a TBLRD is executed, all 22 bits of the TBLPTR
determine which byte is read from program memory
into TABLAT.
FIGURE 6-2:
DS39629C-page 88
Byte
Instruction Register
Control Registers
TABLE LATCH REGISTER (TABLAT)
TABLE POINTER REGISTER
(TBLPTR)
(IR)
and
READS FROM FLASH PROGRAM MEMORY
Table
Pointer
(Even Byte Address)
FETCH
Low
Program Memory
Byte
(Odd Byte Address)
TABLE 6-1:
6.3
The TBLRD instruction is used to retrieve data from
program memory and places it into data RAM. Table
reads from program memory are performed one byte at
a time.
TBLPTR points to a byte address in program space.
Executing TBLRD places the byte pointed to into
TABLAT. In addition, TBLPTR can be modified
automatically for the next table read operation.
The internal program memory is typically organized by
words. The Least Significant bit of the address selects
between the high and low bytes of the word. Figure 6-2
shows the interface between the internal program
memory and the TABLAT.
A typical method for reading data from program memory
is shown in Example 6-1.
TBLRD*
TBLRD*+
TBLRD*-
TBLRD+*
Example
TBLPTR = xxxxx1
TBLRD
Reading the Flash Program
Memory
TBLPTR is not modified
TBLPTR is incremented after the read
TBLPTR is decremented after the read
TBLPTR is incremented before the read
TABLE POINTER
OPERATIONS WITH TBLRD
INSTRUCTIONS
Operation on Table Pointer
Read Register
© 2007 Microchip Technology Inc.
TABLAT
TBLPTR = xxxxx0
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