PSD834F2-15M STMicroelectronics, PSD834F2-15M Datasheet - Page 58

• Manufacturer Part Number: PSD834F2-15M
• Manufacturer: STMicroelectronics

Specifications of PSD834F2-15M

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Package Type: PQFP
• Mounting: Surface Mount
• Pin Count: 52
• Lead Free Status / RoHS Status: Compliant

PSD834F2V
For Users of the HC11 (or compatible). The
HC11 turns off its E clock when it sleeps. There-
fore, if you are using an HC11 (or compatible) in
your design, and you wish to use the Power-down
mode, you must not connect the E clock to CLKIN
(PD1). You should instead connect a crystal oscil-
lator to CLKIN (PD1). The crystal oscillator fre-
quency must be less than 15 times the frequency
of AS. The reason for this is that if the frequency is
greater than 15 times the frequency of AS, the
PSD keeps going into Power-down mode.
Other Power Saving Options. The PSD offers
other reduced power saving options that are inde-
pendent of the Power-down mode. Except for the
PSD Chip Select Input (CSI, PD2) feature, they
are enabled by setting bits in PMMR0 and
PMMR2.
58/95
Figure 29. Enable Power-down Flow Chart
No
by setting PMMR0 bits 4 and 5
Disable desired inputs to PLD
and PMMR2 bits 2 through 6.
Set PMMR0 Bit 1 = 1
PSD in Power
OPTIONAL
for 15 CLKIN
Enable APD
ALE/AS idle
Down Mode
clocks?
RESET
Yes
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