PIC18F8722T-I/PT Microchip Technology, PIC18F8722T-I/PT Datasheet - Page 72

• Manufacturer Part Number: PIC18F8722T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,80PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F8722T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DV164136 - DEVELOPMENT KIT FOR PIC18XLT80PT3 - SOCKET TRAN ICE 80MQFP/TQFPAC164320 - MODULE SKT MPLAB PM3 80TQFPAC174011 - MODULE SKT PROMATEII 80TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F8722 FAMILY
5.2.3
The program memory is addressed in bytes. Instruc-
tions are stored as two bytes or four bytes in program
memory. The Least Significant Byte of an instruction
word is always stored in a program memory location
with an even address (LSb = 0). To maintain alignment
with instruction boundaries, the PC increments in steps
of 2 and the LSb will always read ‘0’ (see Section 5.1.2
“Program Counter”).
Figure 5-5 shows an example of how instruction words
are stored in the program memory.
FIGURE 5-5:
DS39646C-page 70
INSTRUCTIONS IN PROGRAM
MEMORY
Instruction 1:
Instruction 2:
Instruction 3:
INSTRUCTIONS IN PROGRAM MEMORY
Program Memory
Byte Locations
MOVLW
GOTO
MOVFF
055h
0006h
123h, 456h
→
LSB = 1
EFh
C1h
0Fh
F0h
F4h
The CALL and GOTO instructions have the absolute pro-
gram memory address embedded into the instruction.
Since instructions are always stored on word boundar-
ies, the data contained in the instruction is a word
address. The word address is written to PC<20:1>,
which accesses the desired byte address in program
memory. Instruction #2 in Figure 5-5 shows how the
instruction GOTO
memory. Program branch instructions, which encode a
relative address offset, operate in the same manner. The
offset value stored in a branch instruction represents the
number of single-word instructions that the PC will be
offset by. Section 26.0 “Instruction Set Summary”
provides further details of the instruction set.
LSB = 0
55h
03h
00h
23h
56h
0006h is encoded in the program
Word Address
00000Ah
00000Ch
00000Eh
000000h
000002h
000004h
000006h
000008h
000010h
000012h
000014h
© 2008 Microchip Technology Inc.
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