STMPE2403 datasheet(21/63 Pages) STMICROELECTRONICS

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STMPE2403

System controller

21/63

7.4

States of operation

The device has three main modes of operation:

●

Operational Mode: This is the mode, whereby normal operation of the device takes

place. In this mode, the RC clock is available and the Main FSM Unit routes this clock

and the 32 KHz clock to all the device blocks that are enabled. In this mode, individual

blocks that need not be working can be turned off by the master by programming the

bits 3 to 0 of the SYSCON register.

●

Sleep Mode: In this low-power mode, individual blocks can be turned off by the master

by programming the bits 3 to 0 of the SYSCON register. However, the master needs to

program the SYSCON register before coming into this mode, as in the sleep mode, the

IIC interface is not active except to detect traffic for wakeup. Any activity on the I2C port

(intended I2C transaction for the device) or Wakeup pin or Hotkey activity will cause the

device to leave this mode and go into the Operational mode. When leaving this mode,

the I2C will need to hold the SCLK till the RC clock is ready.

●

Hibernate Mode: This mode is entered when the system writes a '1' to bit 5 of the

SYSCON register. In this mode, the device is completely inactive as there is absolutely

no clock. Only a Reset or a wakeup on IIC will bring back the System to operational

mode. A keypress detect will bring the system to Sleep mode, in which the debounce of

the key will take place.

Note:

32KHz clock mentioned in this section could be (1) External clock from connected XTAL, (2)

Externally fed 32KHz clock, or (3) internally generated (from RC OSC) clock. In the case

that internal clock is used, it has a range of 25KHz to 45KHz.

Caution:

Hotkey detection is not possible in hibernate mode.

Figure 4.

States of operation

OPERATIONAL

32K: ON;

4MRC: ON;

SLEEP

32K: ON

4MRC :ONFF

Keypad,

Interrupts & I2C

transaction

Set Disable_32K bit

I2C

transaction

Reset

HIBERNATE

32K: OFF;

4MRC: OFF;

Set Sleep

bit or

autosleep

Valid Key press

detect

OPERATIONAL

32K: ON;

4MRC: ON;

SLEEP

32K: ON

4MRC :ONFF

Keypad,

Interrupts & I2C

transaction

Set Disable_32K bit

I2C

transaction

Reset

HIBERNATE

32K: OFF;

4MRC: OFF;

Set Sleep

bit or

autosleep

Valid Key press

detect

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