XC2000 datasheet(61/647 Pages) INFINEON

61 / 647 page

XC2000 Derivatives

System Units (Vol. 1 of 2)

Architectural Overview

Preliminary

User’s Manual

2-33

V1.0, 2007-06

ArchitectureX2K, V1.0

2.5

Power Management

The XC2000 provides several means to control the power it consumes either at a given

time or averaged over a certain timespan. Three mechanisms can be used (partly in

parallel):

• Supply Voltage Management allows the temporary reduction of the supply voltage

of major parts of the logic, or even the complete disconnection. This drastically

reduces the power consumed because of leakage current, in particular at high

temperature.

Several power reduction modes provide the optimal balance of power reduction and

wake-up time.

• Clock Generation Management controls the distribution and the frequency of

internal and external clock signals. While the clock signals for currently inactive parts

of logic are disabled automatically, the user can reduce the XC2000’s CPU clock

frequency which drastically reduces the consumed power.

External circuitry can be controlled via the programmable frequency output FOUT.

• Peripheral Management permits temporary disabling of peripheral modules. Each

peripheral can separately be disabled/enabled. Also the CPU can be switched off

while the peripherals can continue to operate.

Wake-up from power reduction modes can be triggered either externally by signals

generated by the external system, or internally by the on-chip wake-up timer, which

supports intermittent operation of the XC2000 by generating cyclic wake-up signals. This

offers full performance to quickly react on action requests while the intermittent sleep

phases greatly reduce the average power consumption of the system.

Note: When selecting the supply voltage and the clock source and generation method,

the required parameters must be carefully written to the respective bitfields, to

avoid unintended intermediate states. Recommended sequences are provided

which ensure the intended operation of power supply system and clock system.

XC2000 Datasheet(PDF) 61 Page - Infineon Technologies AG