PIC18F6490-E/PT Microchip Technology, PIC18F6490-E/PT Datasheet - Page 67

• 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: -

5.0
There are two types of memory in PIC18 Flash
microcontroller devices:
• Program Memory
• Data RAM
As Harvard architecture devices, the data and program
memories use separate busses; this allows for
concurrent access of the two memory spaces.
Additional detailed information on the operation of the
Flash program memory is provided in Section 6.0
“Flash Program Memory”.
FIGURE 5-1:
© 2007 Microchip Technology Inc.
CALL,RCALL,RETURN
RETFIE,RETLW
MEMORY ORGANIZATION
High-Priority Interrupt Vector 0008h
Low-Priority Interrupt Vector
PIC18F6390/8390
Program Memory
Stack Level 31
Stack Level 1
Reset Vector
PC<20:0>
Read ‘0’
On-Chip
PROGRAM MEMORY MAP AND STACK FOR PIC18F6390/6490/8390/8490 DEVICES
•
•
•
21
1FFFFFh
0000h
0018h
1FFFh
2000h
PIC18F6390/6490/8390/8490
CALL,RCALL,RETURN
RETFIE,RETLW
5.1
PIC18 microcontrollers implement a 21-bit program
counter, which is capable of addressing a 2-Mbyte
program memory space. Accessing a location between
the upper boundary of the physically implemented
memory and the 2-Mbyte address will return all ‘0’s (a
NOP instruction).
The PIC18FX390 have 8 Kbytes of Flash memory and
can store up to 4,096 single-word instructions and the
PIC18FX490 have 16 Kbytes of Flash memory and can
store up to 8,192 single-word instructions.
PIC18 devices have two interrupt vectors. The Reset
vector address is at 0000h and the interrupt vector
addresses are at 0008h and 0018h.
The
PIC18F6390/6490/8390/8490 devices are shown in
Figure 5-1.
High-Priority Interrupt Vector 0008h
Low-Priority Interrupt Vector
Program Memory Organization
program
PIC18F6490/8490
Program Memory
Stack Level 31
Stack Level 1
Reset Vector
PC<20:0>
Read ‘0’
On-Chip
•
•
•
memory
21
1FFFFFh
0000h
0018h
3FFFh
4000h
DS39629C-page 65
maps
for