ADSP-2188M(RevPrA) Просмотр технического описания (PDF) - Analog Devices

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ADSP-2188M
(Rev.:RevPrA)

DSP Microcomputer

Analog Devices 

April 1999

ADSP-2188M Preliminary Data Sheet

For current information contact Analog Devices at (781) 461-3881

enable or disable servicing of the interrupts (including power down), regardless of the state of IMASK.

Disabling the interrupts does not affect serial port autobuffering or DMA.

ENA INTS;

DIS INTS;

When the processor is reset, interrupt servicing is enabled.

LOW POWER OPERATION

The ADSP-2188M has three low power modes that significantly reduce the power dissipation when the

device operates under standby conditions. These modes are:

• Power Down

• Idle

• Slow Idle

The CLKOUT pin may also be disabled to reduce external power dissipation.

Power Down

The ADSP-2188M processor has a low power feature that lets the processor enter a very low power

dormant state through hardware or software control. Here is a brief list of power-down features. Refer

to the ADSP-2100 Family User’s Manual, “System Interface” chapter, for detailed information about

the power-down feature.

• Quick recovery from power down. The processor begins executing instructions in as few as 200

CLKIN cycles.

• Support for an externally generated TTL or CMOS processor clock. The external clock can contin-

ue running during power down without affecting the lowest power rating and 200 CLKIN cycle

recovery.

• Support for crystal operation includes disabling the oscillator to save power (the processor automat-

ically waits approximately 4096 CLKIN cycles for the crystal oscillator to start or stabilize), and let-

ting the oscillator run to allow 200 CLKIN cycle start up.

• Power down is initiated by either the power down pin (PWD) or the software power-down force

bit.Interrupt support allows an unlimited number of instructions to be executed before optionally

powering down. The power down interrupt also can be used as a non-maskable, edge sensitive in-

terrupt.

• Context clear/save control allows the processor to continue where it left off or start with a clean

context when leaving the power down state.

• The RESET pin also can be used to terminate power down.

• Power down acknowledge pin indicates when the processor has entered power down.

Idle

When the ADSP-2188M is in the Idle Mode, the processor waits indefinitely in a low power state until

an interrupt occurs. When an unmasked interrupt occurs, it is serviced; execution then continues with

the instruction following the IDLE instruction. In Idle mode IDMA, BDMA and autobuffer cycle

steals still occur.

10

This information applies to a product under development. Its characteristics and specifications are subject to change with-

out notice. Analog Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing.

REV. PrA

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