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ST10R272L-B0 数据表(PDF) 2 Page - STMicroelectronics

部件名 ST10R272L-B0
功能描述  16-BIT ROMLESS LOW VOLTAGE MCU WITH MAC
Download  4 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST10R272L-B0 数据表(HTML) 2 Page - STMicroelectronics

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ST10R272L-B0 Errata Sheet
2/4
2.2 ST_MAC.9: COCMP INSTRUCTION INVERTED OPERANDS
According to the ST10 Family Programming Manual, the CoCmp instruction substracts a
40-bit signed operand from the 40-bit accumulator content (acc - op2\op1), and updates the
N, Z and C flags in the MSW register, leaving the accumulator unchanged.
In error, the reverse operation (op2\op1 - acc) has been implemented in the MacUnit. There-
fore, the N and C flags are set according to the reverse operation (Z flag is not affected).
Workaround: Change interpretation of the N and C flags in the MSW register.
2.3 ST_MAC.10: E-FLAG EVALUATION FOR COSHR AND COASHR INSTRUCTIONS
WHEN SATURATION MODE IS ENABLED
The Logical and the Arithmetic Right Shift instructions (CoShr/CoAshr) are specified not to be affected
by the saturation mode (MS bit of the MCW reg.). The result loaded in the accumulator is never saturat-
ed but the evaluation of E flag in the MSW register is erroneous when saturation mode is enabled
and the E flag would be set
.
In this example, the E flag is kept clear however MAE is used.
Workaround: Disable saturation mode before using Logical and Arithmetic Right Shift in-
structions and re-enable it just after.
MS bit is set: saturation
mode is enabled
Accumulator
SL
E
SV
C
Z
N
Example:
Mov
R5,
#5555h
--
----
----h
-
-
-
-
-
-
CoLoad
R5, R5
00
5555
5555h
0
0
0
0
0
0
Nop
00
5555
5555h
0
0
0
0
0
0
Mov
MSW,
#007Fh
7F
5555
5555h
0
0
0
0
0
0
Nop
7F
5555
5555h
0
0
0
0
0
0
CoShr
#1
3F
AAAA
AAAAh
0
0
0
0
0
0
error


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