MA160014 Microchip Technology, MA160014 Datasheet - Page 75

• Manufacturer Part Number: MA160014
• Description: MOD PLUG-IN 44PIN PIC18LF45K22
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of MA160014

• Accessory Type: Plug-In Module (PIM) - PIC18LF45K10
• Product: Microcontroller Modules
• Data Bus Width: 8 bit
• Core Processor: PIC18LF45K22
• Interface Type: I2C, SPI
• Operating Supply Voltage: 1.8 V to 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PICDEM PIC18 Explorer, DM183032
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.2.3
The program memory is addressed in bytes.
Instructions are stored as either 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
increments in steps of 2 and the LSb will always read
‘0’ (see
Figure 5-4
are stored in the program memory.
FIGURE 5-4:
5.2.4
The standard PIC18 instruction set has four two-word
instructions: CALL, MOVFF, GOTO and LSFR. In all
cases, the second word of the instruction always has
‘1111’ as its four Most Significant bits; the other 12 bits
are literal data, usually a data memory address.
The use of ‘1111’ in the 4 MSbs of an instruction
specifies a special form of NOP. If the instruction is
executed in proper sequence – immediately after the
first word – the data in the second word is accessed
EXAMPLE 5-4:
 2010 Microchip Technology Inc.
CASE 1:
Object Code
CASE 2:
Object Code
0110 0110 0000 0000
1100 0001 0010 0011
1111 0100 0101 0110
0010 0100 0000 0000
0110 0110 0000 0000
1100 0001 0010 0011
1111 0100 0101 0110
0010 0100 0000 0000
Section 5.1.1 “Program
shows an example of how instruction words
INSTRUCTIONS IN PROGRAM
MEMORY
TWO-WORD INSTRUCTIONS
with
Instruction 1:
Instruction 2:
Instruction 3:
instruction
INSTRUCTIONS IN PROGRAM MEMORY
TWO-WORD INSTRUCTIONS
Program Memory
Byte Locations
MOVLW
GOTO
MOVFF
Source Code
TSTFSZ
Source Code
MOVFF
ADDWF
TSTFSZ
MOVFF
ADDWF
boundaries,
Counter”).
055h
0006h
123h, 456h

REG1
REG1, REG2 ; No, skip this word
REG3
REG1
REG1, REG2 ; Yes, execute this word
REG3
the

Preliminary
PC
LSB = 1
; is RAM location 0?
; Execute this word as a NOP
; continue code
; is RAM location 0?
; 2nd word of instruction
; continue code
EFh
C1h
0Fh
F0h
F4h
The CALL and GOTO instructions have the absolute
program
instruction. Since instructions are always stored on word
boundaries, 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
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.
provides further details of the instruction set.
and used by the instruction sequence. If the first word
is skipped for some reason and the second word is
executed by itself, a NOP is executed instead. This is
necessary for cases when the two-word instruction is
preceded by a conditional instruction that changes the
PC.
Note:
PIC18(L)F2X/4XK22
Example 5-4
LSB = 0
Section 25.0 “Instruction Set Summary”
memory
55h
03h
00h
23h
56h
See
Execution and the Extended Instruc-
tion Set”
instructions in the extended instruction set.
shows how this works.
Section 5.6 “PIC18 Instruction
0006h is encoded in the program
Word Address
address
00000Ah
00000Ch
00000Eh
000000h
000002h
000004h
000006h
000008h
000010h
000012h
000014h
for information on two-word

Figure 5-4
embedded
DS41412D-page 75
shows how the
into
the