C165UTAH Datasheet, PDF (14/539 Pages) Infineon Technologies AG – EMBEDDED C166 WITH USART IOM-2 AND HDLC SUPPORT

C165UTAH
Overview
Power Management
Besides the basic power-save (power-reduction) modes Idle mode and Power down
mode, the C165UTAH offers a number of additional power management features, which
can be selectively used for effective power reduction. Refer to Table 1.
Table 1
Overview of Power Management Modes
Mode Description
CPU Wake-up
Running The system is fully operational. All clocks and ----
mode peripherals are set and enabled, as determined
by software. Full power consumption.
Slow
down
mode
The CPU runs slower. The oscillator runs at a
lower frequency; the clock is divided by a
programmable factor (1...32). Peripherals
management is possible; incl. PLL On/Off.
Refer to register SYSCON 2.
Controlled by software.
Idle
mode
When the processor has no active tasks to • Any interrupt
perform, it enters Idle mode by the IDLE
• Reset
command. All peripherals remain powered and
clocked, however, peripherals management is
possible. For detailed description see
Chapter 20.1, "Idle Mode".
Sleep
mode
The program stops execution and turns off the • All enabled external
clocks for:
interrupts
• almost the entire chip, but RTC, or
• NMI
• the entire chip.
• RTC timer
The whole clock system is stopped.
(in asynchronous mode)
Refer to register SYSCON 1.
• PEC requests
• ASC interface
• SSC interface
Power
down
mode
The program stops execution (instruction
• Reset
PWRDN) and turns off the clocks for the CPU
and for all peripherals; ports optionally.
Note: Peripherals Management enables the user to control (via software) the clock of
selected peripherals. Refer to register SYSCON 3.
• C165UTAH power requirement in individual modes is described in DC
Characteristics, Table 105
Data Sheet
14
2001-02-23