C511 datasheet(97/128 Pages) SIEMENS

97 / 128 page

Semiconductor Group

8-1

Power Saving Mode

Power Saving Modes

The C511/513 microcontroller provide two power saving modes:

–

Idle mode

–

Power-down mode.

In the idle mode only the CPU will be deactivated, whereas in the power-down mode all operations

will be stopped.

The bits PDE and IDLE, located in SFR PCON, select the power-down mode or the idle mode,

respectively.

If the power-down mode and the idle mode are set at the same time, power-down takes

precedence.

Furthermore, register PCON contains two general purpose flags. For example, the flag bits GF0

and GF1 can be used to give an indication if an interrupt occurred during normal operation or during

the idle mode. An instruction that activates the idle mode also can set one or both flag bits. When

idle is terminated by an interrupt, the interrupt service routine can examine the flag bits.

Special Function Register (Address 87H)

Reset Value : 0XXX0000B

Symbol

Position

Function

SMOD

PCON.7

Baud rate doubled

When set, the baud rate of the serial channel in mode 1,2,3 is

doubled.

–

PCON.6-4

Not implemented. Reserved for future use.

GF1

PCON.3

General purpose flag

GF0

PCON.2

General purpose flag

PDE

PCON.1

Power-down enable bit

When set, power-down mode is entered.

IDLE

PCON.0

Idle mode enable bit

When set, idle mode is entered.

SMOD

–––

87H

PCON

Bit No.

MSB

LSB

GF1

GF0

PDE

IDLE

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