| 摘要 |
A method for having a security device, having official ascending/descending registers (31), provide indicia to be printed on mail pieces so as to take advantage of periods in the security device duty cycle when the security device is normally inactive, including the steps of performing a partial pre - calculation (42) of an indicia taking into account only non-varying and slow ly varying components of the indicia and reusing the partial calculation in a succession of full pre-calculations performed during a rest cycle of the security device. In some applications, the method includes having the securi ty device perform a partial pre-calculation of an indicia taking into account only non-varying and slowly varying components of the indicia; having the security device set aside a location in a scratch pad memory of the security device for use as virtual ascending/descending registers and having the security device set the virtual ascending/descending registers (34) to the current value of the official ascending/descending registers.
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