Datasheet

15 8 7 6 0
S
15 8 7 6 019 16
S
19 16
SXTX[.W] Rdst
SXTX[.W] dst
15 8 7 6 019 162031
0 0...... S
19 16
15 8 7 6 019 16
S
19 16
SXTX.A Rdst
SXTX.A dst
Instruction Set Description www.ti.com
4.6.3.35 SXTX
SXTX.A Extend sign of lower byte to address-word
SXTX.[W] Extend sign of lower byte to word
SXTX.A dst
Syntax
SXTX dst or SXTX.W dst
Operation dst.7 → dst.15:8, Rdst.7 → Rdst.19:8 (Register mode)
Description Register mode: The sign of the low byte of the operand (Rdst.7) is extended into the bits
Rdst.19:8.
Other modes: SXTX.A: the sign of the low byte of the operand (dst.7) is extended into
dst.19:8. The bits dst.31:20 are cleared.
SXTX[.W]: the sign of the low byte of the operand (dst.7) is extended into dst.15:8.
Status Bits N: Set if result is negative, reset otherwise
Z: Set if result is zero, reset otherwise
C: Set if result is not zero, reset otherwise (C = .not.Z)
V: Reset
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example The signed 8-bit data in EDE.7:0 is sign extended to 20 bits: EDE.19:8. Bits 31:20
located in EDE+2 are cleared.
SXTX.A &EDE ; Sign extended EDE -> EDE+2/EDE
Figure 4-58. Sign Extend SXTX.A
Figure 4-59. Sign Extend SXTX[.W]
254
CPUX SLAU144J–December 2004–Revised July 2013
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