ST10F280_12 datasheet(182/239 Pages) STMICROELECTRONICS

182 / 239 page

Power reduction modes

ST10F280

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Doc ID 8673 Rev. 3

In this mode, the Power Down mode can be entered if enabled Fast External Interrupt pins

(EXxIN pins, alternate functions of Port 2 pins, with x = 7...0) are in their inactive level. This

inactive level is configured with the EXIxES bit field in the EXICON register, as follow:

EXICON (F1C0h / E0h)

Address:

0xF1C0H / E0h ESFR

Reset:

0x000h

Type:

R/W

Exiting power down mode

When Power Down mode is entered, the CPU and peripheral clocks are frozen, and the

oscillator and PLL are stopped. Power Down mode can be exited by either asserting RSTIN

or one of the enabled EXxIN pin (Fast External Interrupt).

RSTIN must be held low until the oscillator and PLL have stabilized.

EXxIN inputs are normally sampled interrupt inputs. However, the Power Down mode

circuitry uses them as level-sensitive inputs. An EXxIN (x = 7...0) Interrupt Enable bit (bit

CCxIE in respective CCxIC register) need not to be set to bring the device out of Power

Down mode. An external RC circuit must be connected, as shown in the following figure:

EXI7ES

EXI6ES

EXI5ES

EXI4ES

EXI3ES

EXI2ES

EXI1ES

EXI0ES

R/W

EXIxES (x=7...0) External Interrupt x Edge Selection Field (x=7...0)

00: Fast external interrupts disabled: standard mode

EXxIN pin not taken in account for entering/exiting Power Down mode.

Interrupt on positive edge (rising)

01: Enter Power Down mode if EXiIN = ‘0’, exit if EXxIN = ‘1’ (referred as ‘high’

active level)

10: Interrupt on negative edge (falling)

Enter Power Down mode if EXiIN = ‘1’, exit if EXxIN = ‘0’ (referred as ‘low’ active

level)

11: Interrupt on any edge (rising or falling)

Always enter Power Down mode, exit if EXxIN level changed.

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