Motorola HC12 Refrence Manual page 263

TFR
Operation: See table.
Description: Transfers the content of a source register to a destination register spec-
ified in the instruction. The order in which transfers between 8-bit and 16-
bit registers are specified affects the high byte of the 16-bit registers dif-
ferently. Cases involving TMP2 and TMP3 are reserved for Motorola
use, so some assemblers may not permit their use. It is possible to gen-
erate these cases by using DC.B or DC.W assembler directives.
Condition Codes and Boolean Formulas:
S
–
∆
None affected, unless the CCR is the destination register. Condition
codes take on the value of the corresponding source bits, except that
the X mask bit cannot change from zero to one. Software can leave
the X bit set, leave it cleared, or change it from one to zero, but it can
only be set by a reset or by recognition of an XIRQ interrupt.
Addressing Modes, Machine Code, and Execution Times:
Source Form
TFR abcdxys,abcdxys
Notes:
1. Legal coding for eb is summarized in the following table. Columns represent the high-order digit, and rows rep-
resent the low-order digit in hexadecimal (MSB is a don't-care).
0 1
A ⇒ A B ⇒ A
0
A ⇒ B B ⇒ B
1
A ⇒ CCR B ⇒ CCR
2
sex:A ⇒ TMP2 sex:B ⇒ TMP2
3
sex:A ⇒ D sex:B ⇒ D
4
SEX A,D SEX B,D
sex:A ⇒ X sex:B ⇒ X
5
SEX A,X SEX B,X
sex:A ⇒ Y sex:B ⇒ Y
6
SEX A,Y SEX B,Y
sex:A ⇒ SP sex:B ⇒ SP
7
SEX A,SP SEX B,SP
CPU12
REFERENCE MANUAL
Transfer Register Content
to Another Register
X H I N Z
– – – – –
or
⇓ ∆ ∆ ∆ ∆
Address Mode
INH
B7 eb
2
CCR ⇒ A
TMP3
CCR ⇒ B
TMP3
CCR ⇒ CCR
TMP3
sex:CCR ⇒ TMP2 TMP3 ⇒ TMP2
sex:CCR ⇒ D
TMP3 ⇒ D
SEX CCR,D
sex:CCR ⇒ X
TMP3 ⇒ X
SEX CCR,X
sex:CCR ⇒ Y
TMP3 ⇒ Y
SEX CCR,Y
sex:CCR ⇒ SP
TMP3 ⇒ SP
SEX CCR,SP
INSTRUCTION GLOSSARY
V C
– –
∆ ∆
1
Object Code
3 4
⇒ A B ⇒ A
X
L
⇒ B B ⇒ B
X
L
⇒ CCR B ⇒ CCR
X
L L
D ⇒ TMP2 X ⇒ TMP2 Y ⇒ TMP2 SP ⇒ TMP2
D ⇒ D X ⇒ D
D ⇒ X X ⇒ X
D ⇒ Y X ⇒ Y
D ⇒ SP X ⇒ SP
TFR
Cycles Access Detail
1
P
5 6 7
⇒ A ⇒ A ⇒ A
Y SP
L L L
⇒ B ⇒ B ⇒ B
Y SP
L L L
⇒ CCR Y ⇒ CCR SP ⇒ CCR
L L
Y ⇒ D SP ⇒ D
Y ⇒ X SP ⇒ X
Y ⇒ Y SP ⇒ Y
Y ⇒ SP SP ⇒ SP
MOTOROLA
6-203