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HCS12 bảng dữ liệu(PDF) 60 Page - Freescale Semiconductor, Inc

tên linh kiện HCS12
Giải thích chi tiết về linh kiện  HCS12 Microcontrollers
PDF  452 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
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HCS12 bảng dữ liệu(HTML) 60 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
60
Freescale Semiconductor
5.7 Binary-Coded Decimal Instructions
To add binary-coded decimal (BCD) operands, use addition instructions that
set the half-carry bit in the CCR, then adjust the result with the decimal
adjust A (DAA) instruction. Table 5-5 is a summary of instructions that can
be used to perform BCD operations.
Table 5-5. BCD Instructions
Mnemonic
Function
Operation
ABA
Add B to A
(A)
+ (B) ⇒ A
ADCA
Add with carry to A
(A)
+ (M) + C ⇒ A
ADCB(1)
1. These instructions are not normally used for BCD operations because, although they affect H
correctly, they do not leave the result in the correct accumulator (A) to be used with the DAA
instruction. Thus additional steps would be needed to adjust the result to correct BCD form.
Add with carry to B
(B)
+ (M) + C ⇒ B
ADDA(1)
Add memory to A
(A)
+ (M) ⇒ A
ADDB
Add memory to B
(B)
+ (M) ⇒ B
DAA
Decimal adjust A
(A)10



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