C167CS-4RM datasheet(36/517 Pages) INFINEON

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C167CS

Derivatives

Architectural Overview

User’s Manual

2-19

V2.0, 2000-07

Slowdown operation is achieved by dividing the oscillator clock by a programmable

factor (1 … 32) resulting in a low frequency device operation which significantly reduces

the overall power consumption.

Flexible Peripheral Management

The flexible peripheral management provides a mechanism to enable and disable each

peripheral module separately. In each situation (e.g. several system operating modes,

standby, etc.) only those peripherals may be kept running which are required for the

respective functionality. All others can be switched off. It also allows the operation

control of whole groups of peripherals including the power required for generating and

distributing their clock input signal. Other peripherals may remain active, e.g. in order to

maintain communication channels. The registers of separately disabled peripherals (not

within a disabled group) can still be accessed.

Periodic Wakeup from Idle Mode

Periodic wakeup from Idle mode combines the drastically reduced power consumption

in Idle mode (in conjunction with the additional power management features) with a high

level of system availability. External signals and events can be scanned (at a lower rate)

by periodically activating the CPU and selected peripherals which then return to

powersave mode after a short time. This greatly reduces the system’s average power

consumption.

2.5

Protected Bits

The C167CS provides a special mechanism to protect bits which can be modified by the

on-chip hardware from being changed unintentionally by software accesses to related

bits (see also Chapter 4).

The following bits are protected:

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