SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 411

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

21.5
The power consumed by the C164CM also depends on the amount of active logic.
Peripheral management enables the system designer to deactivate those on-chip
peripherals not required in a given system status (such as a certain interface mode or
standby). All modules remaining active will continue with their usual performance. If all
modules fed by the Peripheral Clock Driver (PCD) are disabled and the other functions
fed by the PCD are not required, this clock driver itself may also be disabled to save
additional power.
This flexibility is accomplished by distributing the CPU clock via several clock drivers,
each of which can be separately controlled, and can also be smaller.
Figure 21-5 CPU Clock Distribution
Note: The Real Time Clock (RTC) is fed by a separate clock driver, so it can be kept
The registers of the generic peripherals can be accessed even while the respective
module is disabled, as long as PCD is running. The registers of peripherals connected
to ICD can be accessed even in this case, of course. The registers of X-peripherals
cannot be accessed while the respective module is disabled by any means.
While a peripheral is disabled, its output pins remain in the state they had at the time of
disabling.
This flexible peripheral management is controlled by software via register SYSCON3 in
which each control bit is associated with an on-chip peripheral module.
User’s Manual
running even in Power Down mode while all the other circuitry is disconnected
from the clock.
Flexible Peripheral Management
Generation
Clock
RTC
CCD
PCD
21-15
ICD
Idle Mode
CPU
PCDDIS
Peripherals,
Ports, Intr. Ctrl.
Interface
Peripherals,
FOUT
MCA04479
Power Management
C164CM/C164SM
Derivatives
V1.0, 2002-02