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7.6.1
Power Saving Modes of the SAB 80515/80535
The SAB 80515/80535 allows a reduction of the power consumption using the power-down mode.
7.6.1.1 Power-Down Mode of the SAB 80515/80535
The power-down mode in the SAB 80515/80535 allows a reduction of
bytes of the on-chip RAM through a backup supply connected to the
V
V
terms
and
are used to specify the voltages on pin
CC
PD
>
V
V
lf
, the 40 bytes are supplied from
CC
PD
the 40 bytes is drawn from
88 to 127 (58 H to 7F H ). The current drawn from the backup power supply is typically 1 mA, max. 3
mA.
To utilize this feature, the user's system - upon detecting an imminent power failure - would interrupt
the processor in some manner to transfer relevant data to the 40-byte on-chip RAM and enable the
backup power supply to the
its operating limit. When power returns, a power-on reset should be accomplished, and the backup
supply needs to stay on long enough to resume normal operation. Figure 7-43 illustrates the timing
upon a power failure.
Figure 7-43
Reset and RAM Backup Power Timing of the SAB 80515/80535
Semiconductor Group
V
CC
V
. The addresses of these backup-powered RAM locations range from
PD
V
pin. Then a reset should be accomplished before
PD
On-Chip Peripheral Components
V
and pin
CC
V
.
may then below. lf
PD
*
99
V
, to zero while saving 40
CC
V
pin. In the following, the
PD
V
, respectively.
PD
<
V
V
, the current for
CC
PD
V
falls below
CC
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