Freescale-semiconductor StarCore SC140 Instrukcja Użytkownika Strona 718

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A-404 SC140 DSP Core Reference Manual
TFR
T-Z
TFR Transfer Data Register to Data Register (DALU) TFR
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed By Instruction
Example 1
tfr d15,d14
Example 2
tfr d7,d6
Scaling up set by SR[5}, so L6 bit is set by bit 30 overflow.
Operation Assembler Syntax
Da Dn
TFR Da,Dn
TFR Da,Dn
Copies a source data register (Da) to a destination data register (Dn). The Ln bit is re-calculated (not
copied) in the destination register. Saturation mode is ignored and no saturation is done.
Register Address Bit Name Description
SR[5:4] S[1:0] Scaling bits determine which bits in the result are used in the Ln bit
calculation.
Register Address Bit Name Description
Ln L Calculates and updates the Ln bit in the destination register.
Register/Memory Address Before After
SR
$00E0 0000
D15
$FF F23A 1422
L14:D14
$0:$FF F23A 1422
Register/Memory Address Before After
SR
$00E0 0020
D7
$00 5000 0000
D6
$1:$00 5000 0000
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