SIC63616-(Rev. 1.0) NO. P148
3240-0412
NF: Negative flag (FF76H•D3)
Indicates whether the operation result is a positive value or a negative value.
When "1" is read: Negative value (MSB of the results is "1")
When "0" is read: Positive value (MSB of the results is "0")
Writing: Invalid
NF is a read-only bit, so writing operation is invalid.
At initial reset, this flag is set to "0".
4.12.7 Programming note
An operation process takes 10 CPU clock cycles (5 bus cycles) after writing to the calculation mode select
register CALMD until the operation result is set to the destination register DRH/DRL and the operation
flags. While this operation is in process, do not read/write from/to the destination register DRH/DRL and
do not read NF/VF/ZF.
Содержание S1C63616
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