C161U Datasheet, PDF (381/469 Pages) Infineon Technologies AG – Embedded C166 with USB, USART and SSC

C161U
System Control Unit (CSCU)
20
System Control Unit (CSCU)
20.1
Introduction
System Control Unit CSCU is used to control system specific tasks such as reset control
or power management (see previous Chapter "Power Reduction Modes") within an on-
chip system build around the Infineons Cell-Based Core C166. The power management
features of the CSCU provide effective means to realize standby conditions for the
system with an optimum balance between power reduction, peripheral operation and
system functionality. Additionally, the CSCU controls the modes and operation of Real
Time Clock RTC.
Summary of Features and Functions
CSCU is characterized by the following functions:
– Central Control of system operation
– External interrupt and frequency output control
– Protection management for system control registers
– General XBUS peripherals control
– Control of visibility of XPERs
– Power management additional to the standard Idle and Power Down modes
– Sleep mode with wakeup from Power Down state by external interrupts
– Peripheral Management with individual clock and power control of peripherals
– Control of power down state of Flash modules during Idle
– Flexible clock generation management
– Programmable system Slow Down control with or without PLL
– Control interface for Clock Generation Unit
– Identification register block for chip and CSCU identification
– Device, revision, manufacturer
– CSCU identification register
20.2
Operational Overview
20.2.1 Overview of CSCU submodules
In the following paragraphs a functional overview of the different blocks and submodules
of the System Control Unit is presented.
XBUS Peripheral Configuration Block
In the C161U, XBUS peripherals can be separately switched on or off by programming
the XPERCON register. If switched off, the respective peripheral is not visible, meaning,
that its address space and its functional pins are not occupied.
Data Sheet
381
2001-04-19