PIC18F6490-E/PT Microchip Technology, PIC18F6490-E/PT Datasheet - Page 13

• Manufacturer Part Number: PIC18F6490-E/PT
• Description: IC PIC MCU FLASH 16KX16 64TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

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: -

3.3
Programming code memory is accomplished by first
loading data into the appropriate write buffers and then
initiating a programming sequence. The write buffer is
16 bytes in size and can be mapped to any 16-byte
area in code memory (see Figure 3-4). The actual
memory write sequence takes the contents of these
buffers and programs the 16-byte code memory region
pointed to by the Table Pointer once the programming
sequence is initiated.
The programming duration is externally timed and is
controlled by PGC. After a “Start Programming”
command is issued (4-bit command, ‘1111’), a NOP is
issued, where the 4th PGC is held high for the duration
of the programming time, P9 (see Figure 3-7).
FIGURE 3-4:
FIGURE 3-5:
© 2007 Microchip Technology Inc.
Code Memory Programming
Note:
Note:
TBLPTR<21:14> = 0
TBLPTR<21:13> = 0
TBLPTR<3:0> = 0h
TBLPTR<3:0> = 1h
TBLPTR<3:0> = 2h
TBLPTR<3:0> = 3h
TBLPTR<3:0> = 4h
TBLPTR<3:0> = 5h
TBLPTR<3:0> = 6h
TBLPTR<3:0> = 7h
TBLPTR<3:0> = 8h
TBLPTR<3:0> = 9h
TBLPTR<3:0> = Ah
TBLPTR<3:0> = Bh
TBLPTR<3:0> = Ch
TBLPTR<3:0> = Dh
TBLPTR<3:0> = Eh
TBLPTR<3:0> = Fh
TBLPTR<3:0> = 0h
TBLPTR<3:0> = 1h
TBLPTR<3:0> = 2h
TBLPTR<3:0> = 3h
TBLPTR<3:0> = 4h
TBLPTR<3:0> = 5h
TBLPTR<3:0> = 6h
TBLPTR<3:0> = 7h
TBLPTR<3:0> = 8h
TBLPTR<3:0> = 9h
TBLPTR<3:0> = Ah
TBLPTR<3:0> = Bh
TBLPTR<3:0> = Ch
TBLPTR<3:0> = Dh
TBLPTR<3:0> = Eh
TBLPTR<3:0> = Fh
WRITE BOUNDARIES FOR PIC18FX310/X390/X393 DEVICES
WRITE BOUNDARIES FOR PIC18FX410/X490/X493 DEVICES
TBLPTR = TBLPTRU:TBLPTRH:TBLPTRL.
TBLPTR = TBLPTRU:TBLPTRH:TBLPTRL.
PIC18F8410/8490/8493 FAMILY
Offset = TBLPTR<13:4>
Offset = TBLPTR<12:4>
After PGC is brought low, the programming sequence
is terminated. PGC must be held low for the time
specified by parameter P10 to allow high-voltage
discharge of the memory array.
The
PIC18F8410/8490/8493 family device is shown in
Table 3-3. The flowchart shown in Figure 3-6 depicts
the
PIC18F8410/8490/8493 family device. The timing
diagram that details the “Start Programming” command
and parameter P10, is shown in Figure 3-7.
Note:
logic
code
The TBLPTR register must contain the
same offset value when initiating the
programming sequence as it did when the
write buffers were loaded.
CODE MEMORY
CODE MEMORY
necessary
sequence
to
completely
to
000000h
003FFFh
000000h
001FFFh
DS39624C-page 13
program
write
a
a