ST10F296 datasheet(241/346 Pages) STMICROELECTRONICS

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Power reduction modes

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21.2.1

Protected power-down mode

This mode is selected when the PWDCFG bit of the SYSCON register is cleared. Protected

power-down mode is only activated if the NMI pin is pulled low when executing the PWRDN

instruction. This mode is only deactivated with an external hardware reset on the RSTIN pin.

21.2.2

Interruptible power-down mode

This mode is selected when the PWDCFG bit of the SYSCON register is set (see

Section 23: Register set on page 248).

Interruptible power-down mode is only activated if all the enabled fast external interrupt pins

are at their inactive level (see Table 134: EXICON register description).

This mode is deactivated with an external reset applied to the RSTIN pin, with an interrupt

request applied to one of the fast external interrupt pins, with an interrupt generated by the

RTC, or with an interrupt generated by activity on the interfaces of the CAN and I2C

modules. To allow the internal PLL and clock to stabilize, the RSTIN pin must be held low

according the recommendations described in Section 20: System reset.

EXICON register

EXxIN inputs are normally sampled interrupt inputs. However, the power-down mode

circuitry uses them as level-sensitive inputs.

An EXxIN (x = 3...0) interrupt enable bit (bit CCxIE in the CCxIC register) does not need to

be set to bring the device out of power-down mode. An external RC circuit must be

connected to the RPD pin, as shown in Figure 93.

EXICON (F1C0h/E0h)

ESFR

Reset value: 0000h

987

65432

EXI7ES

EXI6ES

EXI5ES

EXI4ES

EXI3ES

EXI2ES

EXI1ES

EXI0ES

R/W

R/WR/W

Table 134.

EXICON register description

Bit

Bit name

Function

15-0

EXIxES

External interrupt x edge selection field (x = 7...0)

00: Fast external interrupts disabled (referred to as standard mode). The

EXxIN pin is not taken into account for entering/exiting power-down

mode.

01: Interrupt on positive edge (rising). Power-down mode is entered if

EXiIN = 0 and exited if EXxIN = 1 (referred to as ‘high’ active level).

10: Interrupt on negative edge (falling). Power-down mode is entered if

EXiIN = 1 and exited if EXxIN = 0 (referred to as ‘low’ active level).

11: Interrupt on any edge (rising or falling). Power-down mode is always

entered and is exited if EXxIN level changes.

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