Information

PIC18F8722 FAMILY
DS39646C-page 346 © 2008 Microchip Technology Inc.
MOVFF Move f to f
Syntax: MOVFF f
s
,f
d
Operands: 0 ≤ f
s
≤ 4095
0 ≤ f
d
≤ 4095
Operation: (f
s
) → f
d
Status Affected: None
Encoding:
1st word (source)
2nd word (destin.)
1100
1111
ffff
ffff
ffff
ffff
ffffs
ffffd
Description: The contents of source register ‘f
s
’ are
moved to destination register ‘f
d
’.
Location of source ‘f
s
’ can be anywhere
in the 4096-byte data space (000h to
FFFh) and location of destination ‘f
d
’
can also be anywhere from 000h to
FFFh.
Either source or destination can be W
(a useful special situation).
MOVFF is particularly useful for
transferring a data memory location to a
peripheral register (such as the transmit
buffer or an I/O port).
The MOVFF instruction cannot use the
PCL, TOSU, TOSH or TOSL as the
destination register
Words: 2
Cycles: 2 (3)
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register ‘f’
(src)
Process
Data
No
operation
Decode No
operation
No dummy
read
No
operation
Write
register ‘f’
(dest)
Example:
MOVFF REG1, REG2
Before Instruction
REG1 = 33h
REG2 = 11h
After Instruction
REG1 = 33h
REG2 = 33h
MOVLB Move Literal to Low Nibble in BSR
Syntax: MOVLW k
Operands: 0 ≤ k ≤ 255
Operation: k → BSR
Status Affected: None
Encoding: 0000 0001 kkkk kkkk
Description: The eight-bit literal ‘k’ is loaded into the
Bank Select Register (BSR). The value
of BSR<7:4> always remains ‘0’
regardless of the value of k
7
:k
4
.
Words: 1
Cycles: 1
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
literal ‘k’
Process
Data
Write literal
‘k’ to BSR
Example:
MOVLB 5
Before Instruction
BSR Register = 02h
After Instruction
BSR Register = 05h