 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
SAFC161PI Datasheet(PDF) 67 Page - Infineon Technologies AG |
|
|
|||||||||||||||||||||||||||||
SAFC161PI Datasheet(HTML) 67 Page - Infineon Technologies AG |
|
|
67 / 400 page  &3, 7KH &HQWUDO 3URFHVVLQJ 8QLW &38 User’s Manual 4-19 1999-08 For multiplication and division the V-flag is set to ’1’, if the result cannot be represented in a word data type, otherwise it is cleared. Note that a division by zero will always cause an overflow. In contrast to the result of a division, the result of a multiplication is valid regardless of whether the V-flag is set to ’1’ or not. Since logical ALU operations cannot produce an invalid result, the V-flag is cleared by these operations. The V-flag is also used as ’Sticky Bit’ for rotate right and shift right operations. With only using the C-flag, a rounding error caused by a shift right operation can be estimated up to a quantity of one half of the LSB of the result. In conjunction with the V-flag, the C-flag allows evaluating the rounding error with a finer resolution (see table below). For Boolean bit operations with only one operand the V-flag is always cleared. For Boolean bit operations with two operands the V-flag represents the logical ORing of the two specified bits. • Z-Flag: The Z-flag is normally set to ’1’, if the result of an ALU operation equals zero, otherwise it is cleared. For the addition and subtraction with carry the Z-flag is only set to ’1’, if the Z-flag already contains a ’1’ and the result of the current ALU operation additionally equals zero. This mechanism is provided for the support of multiple precision calculations. For Boolean bit operations with only one operand the Z-flag represents the logical negation of the previous state of the specified bit. For Boolean bit operations with two operands the Z-flag represents the logical NORing of the two specified bits. For the prioritize ALU operation the Z-flag indicates, if the second operand was zero or not. • E-Flag: The E-flag can be altered by instructions, which perform ALU or data movement operations. The E-flag is cleared by those instructions which cannot be reasonably used for table search operations. In all other cases the E-flag is set depending on the value of the source operand to signify whether the end of a search table is reached or not. If the value of the source operand of an instruction equals the lowest negative number, which is representable by the data format of the corresponding instruction (’8000 H’ for the word data type, or ’80H’ for the byte data type), the E-flag is set to ’1’, otherwise it is cleared. Table 4-2 Shift Right Rounding Error Evaluation C-Flag V-Flag Rounding Error Quantity 0 0 1 1 0 1 0 1 - No rounding error - 0 < Rounding error < 1/ 2 LSB Rounding error = 1/ 2 LSB Rounding error > 1/ 2 LSB |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
