PIC18F46K80-I/P Microchip Technology Inc., PIC18F46K80-I/P Datasheet - Page 132
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PIC18F46K80-I/P
Manufacturer Part Number
PIC18F46K80-I/P
Description
40 PDIP .600IN TUBE, ECAN, 64KB FLASH, 4KB RAM, 16 MIPS, 12-BIT ADC, CTMU
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F46K80-IPT.pdf
(628 pages)
Specifications of PIC18F46K80-I/P
A/d Inputs
11-Channel, 12-Bit
Comparators
2
Cpu Speed
16 MIPS
Eeprom Memory
1K Bytes
Input Output
35
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
44-pin PDIP
Programmable Memory
64K Bytes
Ram Size
3.6K Bytes
Speed
64 MHz
Temperature Range
–40 to 125 °C
Timers
2-8-bit, 3-16-bit
Voltage, Range
1.8-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
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Addressing using FSR2 and its associated operands.
PIC18F66K80 FAMILY
6.6
Enabling the PIC18 extended instruction set (XINST
Configuration bit = 1 ) significantly changes certain
aspects of data memory and its addressing. Using the
Access Bank for many of the core PIC18 instructions
introduces a new addressing mode for the data memory
space. This mode also alters the behavior of Indirect
What does not change is just as important. The size of
the data memory space is unchanged, as well as its
linear addressing. The SFR map remains the same.
Core PIC18 instructions can still operate in both Direct
and Indirect Addressing mode. Inherent and literal
instructions do not change at all. Indirect Addressing
with FSR0 and FSR1 also remains unchanged.
6.6.1
Enabling the PIC18 extended instruction set changes
the behavior of Indirect Addressing using the FSR2
register pair and its associated file operands. Under the
proper conditions, instructions that use the Access
Bank – that is, most bit-oriented and byte-oriented
instructions – can invoke a form of Indexed Addressing
using an offset specified in the instruction. This special
addressing mode is known as Indexed Addressing with
Literal Offset or the Indexed Literal Offset mode.
When using the extended instruction set, this
addressing mode requires the following:
• Use of the Access Bank (‘a’ = 0 )
• A file address argument that is less than or equal
Under these conditions, the file address of the
instruction is not interpreted as the lower byte of an
address (used with the BSR in Direct Addressing) or as
an 8-bit address in the Access Bank. Instead, the value
is interpreted as an offset value to an Address Pointer
specified by FSR2. The offset and the contents of FSR2
are added to obtain the target address of the operation.
6.6.2
Any of the core PIC18 instructions that can use Direct
Addressing are potentially affected by the Indexed
Literal Offset Addressing mode. This includes all
byte-oriented and bit-oriented instructions, or almost
one-half of the standard PIC18 instruction set. Instruc-
tions that only use Inherent or Literal Addressing
modes are unaffected.
Additionally, byte-oriented and bit-oriented instructions
are not affected if they do not use the Access Bank
(Access RAM bit = 1 ), or include a file address of 60h
or above. Instructions meeting these criteria will
DS39977C-page 132
to 5Fh
Data Memory and the Extended
Instruction Set
INDEXED ADDRESSING WITH
LITERAL OFFSET
INSTRUCTIONS AFFECTED BY
INDEXED LITERAL OFFSET MODE
Preliminary
continue to execute as before. A comparison of the dif-
ferent possible addressing modes when the extended
instruction set is enabled is shown in
Those who desire to use byte-oriented or bit-oriented
instructions in the Indexed Literal Offset mode should
note the changes to assembler syntax for this mode.
This is described in more detail in
“Extended Instruction Syntax”
2011 Microchip Technology Inc.
.
Figure
Section 29.2.1
6-9.
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