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ADSP-2186L1111 Datasheet(PDF) 6 Page - Analog Devices

Part No. ADSP-2186L1111
Description  DSP Microcomputer
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com

ADSP-2186L1111 Datasheet(HTML) 6 Page - Analog Devices

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Interrupt routines can either be nested, with higher priority
interrupts taking precedence, or processed sequentially. Inter-
rupts can be masked or unmasked with the IMASK register.
Individual interrupt requests are logically ANDed with the bits
in IMASK; the highest priority unmasked interrupt is then
selected. The power-down interrupt is nonmaskable.
The ADSP-2186L masks all interrupts for one instruction cycle
following the execution of an instruction that modifies the
IMASK register. This does not affect serial port autobuffering
or DMA transfers.
The interrupt control register, ICNTL, controls interrupt nest-
ing and defines the
IRQ0, IRQ1 and IRQ2 external interrupts to
be either edge- or level-sensitive. The
IRQE pin is an external
edge-sensitive interrupt and can be forced and cleared. The
IRQL0 and IRQL1 pins are external level-sensitive interrupts.
The IFC register is a write-only register used to force and clear
On-chip stacks preserve the processor status and are automati-
cally maintained during interrupt handling. The stacks are twelve
levels deep to allow interrupt, loop and subroutine nesting.
The following instructions allow global enable or disable servic-
ing of the interrupts (including power-down), regardless of the
state of IMASK. Disabling the interrupts does not affect serial
port autobuffering or DMA.
When the processor is reset, interrupt servicing is enabled.
The ADSP-2186L has three low power modes that significantly
reduce the power dissipation when the device operates under
standby conditions. These modes are:
• Power-Down
• Slow Idle
The CLKOUT pin may also be disabled to reduce external
power dissipation.
The ADSP-2186L processor has a low power feature that lets
the processor enter a very low power dormant state through
hardware or software control. Following is a brief list of power-
down features. Refer to the ADSP-218x DSP Hardware Reference,
“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 400 CLKIN cycles.
Support for an externally generated TTL or CMOS proces-
sor clock. The external clock can continue running during
power-down without affecting the lowest power rating and
400 CLKIN cycle recovery.
Support for crystal operation includes disabling the oscillator
to save power (the processor automatically waits approxi-
mately 4096 CLKIN cycles for the crystal oscillator to start
or stabilize), and letting the oscillator run to allow 400 CLKIN
cycle start-up.
Power-down is initiated by either the power-down pin (
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 nonmaskable, edge-
sensitive interrupt.
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.
RESET pin also can be used to terminate power-down.
Power-down acknowledge (PWDACK) pin indicates when
the processor has entered power-down.
When the ADSP-2186L 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 con-
tinues with the instruction following the IDLE instruction. In Idle
mode IDMA, BDMA and autobuffer cycle steals still occur.
Slow Idle
The IDLE instruction is enhanced on the ADSP-2186L to let
the processor’s internal clock signal be slowed, further reducing
power consumption. The reduced clock frequency, a program-
mable fraction of the normal clock rate, is specified by a select-
able divisor given in the IDLE instruction. The format of the
instruction is:
IDLE (n)
where n = 16, 32, 64 or 128. This instruction keeps the proces-
sor fully functional, but operating at the slower clock rate. While
it is in this state, the processor’s other internal clock signals such
as SCLK, CLKOUT and timer clock, are reduced by the same
ratio. The default form of the instruction, when no clock divisor
is given, is the standard IDLE instruction.
When the IDLE (n) instruction is used, it effectively slows down
the processor’s internal clock and thus its response time to incom-
ing interrupts. The one-cycle response time of the standard idle
state is increased by n, the clock divisor. When an enabled inter-
rupt is received, the ADSP-2186L will remain in the idle state
for up to a maximum of n processor cycles (n = 16, 32, 64 or
128) before resuming normal operation.
When the IDLE (n) instruction is used in systems that have an
externally generated serial clock (SCLK), the serial clock rate
may be faster than the processor’s reduced internal clock rate.
Under these conditions, interrupts must not be generated at a
faster rate than can be serviced due to the additional time the
processor takes to come out of the idle state (a maximum of n
processor cycles).

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