C167CS datasheet(127/517 Pages) INFINEON

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C167CS

Derivatives

Clock Generation

User’s Manual

6-9

V2.0, 2000-07

6.4

Clock Drivers

The operating clock signal

fCPU is distributed to the controller hardware via several clock

drivers which are disabled under certain circumstances. The real time clock RTC is

clocked via a separate clock driver which delivers the prescaled oscillator clock (contrary

to the other clock drivers). Table 6-2 summarizes the different clock drivers and their

function, especially in power reduction modes:

Note: Disabling PCD by setting bit PCDDIS stops the clock signal for all connected

modules. Make sure that all these modules are in a safe state before stopping their

clock signal.

The port input and output values will not change while PCD is disabled

(ASC0 and SSC will still operate, if active),

CLKOUT will be high if enabled.

Please also respect the hints given in section Section 21.5.

Table 6-2

Clock Drivers Description

Clock Driver

Clock

Signal

Active

Mode

Idle

Mode

Power

Down

and Sleep

Mode

Connected Circuitry

CCD

CPU

Clock Driver

fCPU

Off

CPU,

internal memory modules

(IRAM, ROM/OTP/Flash)

ICD

Interface

Clock Driver

fCPU

Off

ASC0, WDT, SSC,

interrupt detection

circuitry

PCD

Peripheral

Clock Driver

fCPU

Control via

PCDDIS

Control via

PCDDIS

Off

(X)Peripherals (timers,

etc.) except those driven

by ICD,

interrupt controller, ports

RCD

RTC

Clock Driver

fRTC

Control via

PDCON /

SLEEP-

CON

Realtime clock

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