Microchip Technology MA320001 Data Sheet
© 2011 Microchip Technology Inc.
DS61143H-page 41
PIC32MX3XX/4XX
3.3
Power Management
The MIPS32
®
M4K
®
Processor Core offers a number
of power management features, including low-power
design, active power management and power-down
modes of operation. The core is a static design that
supports slowing or halting the clocks, which reduces
system power consumption during idle periods.
design, active power management and power-down
modes of operation. The core is a static design that
supports slowing or halting the clocks, which reduces
system power consumption during idle periods.
3.3.1
INSTRUCTION-CONTROLLED
POWER MANAGEMENT
POWER MANAGEMENT
The mechanism for invoking power-down mode is
through execution of the WAIT instruction. For more
information on power management, see
through execution of the WAIT instruction. For more
information on power management, see
3.3.2
LOCAL CLOCK GATING
The majority of the power consumed by the
PIC32MX3XX/4XX family core is in the clock tree and
clocking registers. The PIC32MX family uses extensive
use of local gated-clocks to reduce this dynamic power
consumption.
PIC32MX3XX/4XX family core is in the clock tree and
clocking registers. The PIC32MX family uses extensive
use of local gated-clocks to reduce this dynamic power
consumption.
3.4
EJTAG Debug Support
The MIPS32
®
M4K
®
Processor Core provides for an
Enhanced JTAG (EJTAG) interface for use in the
software debug of application and kernel code. In
addition to standard user mode and kernel modes of
operation, the core provides a Debug mode that is
entered after a debug exception (derived from a
hardware breakpoint, single-step exception, etc.) is
taken and continues until a debug exception return
(DERET) instruction is executed. During this time, the
processor executes the debug exception handler
routine.
software debug of application and kernel code. In
addition to standard user mode and kernel modes of
operation, the core provides a Debug mode that is
entered after a debug exception (derived from a
hardware breakpoint, single-step exception, etc.) is
taken and continues until a debug exception return
(DERET) instruction is executed. During this time, the
processor executes the debug exception handler
routine.
The EJTAG interface operates through the Test Access
Port (TAP), a serial communication port used for
transferring test data in and out of the core. In addition
to the standard JTAG instructions, special instructions
defined in the EJTAG specification define what
registers are selected and how they are used.
Port (TAP), a serial communication port used for
transferring test data in and out of the core. In addition
to the standard JTAG instructions, special instructions
defined in the EJTAG specification define what
registers are selected and how they are used.