HCS12 datasheet(300/452 Pages) FREESCALE

部件名	HCS12

功能描述	HCS12 Microcontrollers

PDF	452 Pages

Scroll/Zoom	100%

制造商	FREESCALE [Freescale Semiconductor, Inc]

网页	http://www.freescale.com

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Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

300

Freescale Semiconductor

Operation:

(A) – $00

Description:

Subtracts $00 from the content of accumulator A and sets the condition

codes accordingly.

The subtraction is accomplished internally without modifying A.

The TSTA instruction provides limited information when testing unsigned

values. Since no unsigned value is less than zero, BLO and BLS have no

utility following TSTA. While BHI can be used after TST, it performs the

same function as BNE, which is preferred. After testing signed values, all

signed branches are available.

TSTA

Test A

TSTA

CCR Details:

HIN

––––

∆∆

N: Set if MSB of result is set; cleared otherwise

Z: Set if result is $00; cleared otherwise

V: 0; cleared

C: 0; cleared

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

TSTA

INH

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