DM164120-1 Microchip Technology, DM164120-1 Datasheet - Page 15

• Manufacturer Part Number: DM164120-1
• Description: BOARD DEMO PICKIT 2 LP COUNT
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM164120-1

• Contents: 3 Boards (1 Populated, 2 Bare)
• Processor To Be Evaluated: PIC16F690
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC16
• Silicon Core Number: PIC16F
• Silicon Family Name: PIC16F6xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: 28-pin PIC16C, 16F, 18C, 18F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2005 Microchip Technology Inc.
Mid-Range PICmicro
2.3.1
Numbers in the Assembler
Org (Origin)
End
Defining Data Memory Locations
EXAMPLE 2-1:
Unless there is a reason to want a name to a specific location, the cblock/endc
method is preferred. The advantage is that as variables come and go through the
development process, the cblock keeps the block to a minimum. Using one of the other
methods, you may have to go back and find an unused location.
#define Length
Length
Length
Width
Area:2
Girth
Unless otherwise specified, the assembler assumes any numeric constants in
the program are hexadecimal (base 16). Binary (base 2), Octal (base 8), Decimal
(base 10), and ASCII coding are also supported.
Org tells the Assembler where to start generating code. Normally we start coding
at address ‘0000’, but it could be anywhere. Baseline devices have a Reset
vector at the last location in program memory, so it’s good practice to have a
GOTO instruction pointing to the beginning of the program.
End tells the assembler to stop assembling. There must be one at the end of the
program. It does not necessarily have to be at the end of the file, but nothing after
the end statement will be assembled.
There are three ways to name a location (see Example 2-1).
cblock
endc
Hexadecimal:
Decimal
Octal
Binary
ASCII
Assembler Basics
equ
DEFINING DATA MEMORY
0x20
0x20
0x20
12 or 0x12 or H'12'
.12 or D'12'
O'12'
B'00010010'
A'c' or 'c'
;c-like syntax
;equate 0x20 with the symbol
;start a block of variables
;this will be at address 0x20
;this will be at address 0x21
;this is 2 bytes long, starting at
;address 0x22
;this will be at address 0x24
®
Architectural Overview
DS51556A-page 11