PSD934210MT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD934210MT

Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit + 256 Kbit Dual Flash Memories and 64 Kbit SRAM

STMicroelectronics 

PSD834F2V

2. Typical current consumption assuming no PLD inputs are changing state and the PLD Turbo bit is 0.

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.

Figure 30. Enable Power-down Flow Chart

RESET

Enable APD

Set PMMR0 Bit 1 = 1

OPTIONAL

Disable desired inputs to PLD

by setting PMMR0 bits 4 and 5

and PMMR2 bits 2 through 6.

No

ALE/AS idle

for 15 CLKIN

clocks?

Yes

PSD in Power

Down Mode

AI02892

Other Power Saving Options. The PSD offers

other reduced power saving options that are inde-

pendent of the Power-down mode. Except for the

SRAM Stand-by and PSD Chip Select Input (CSI,

PD2) features, they are enabled by setting bits in

PMMR0 and PMMR2.

57/89

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