S9S08SL8F1CTJ Datasheet, PDF(186/356 Page) Freescale Semiconductor, Inc – provides the functional version of the on-chip modules

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S9S08SL8F1CTJ Datasheet, PDF (186/356 Pages) Freescale Semiconductor, Inc – provides the functional version of the on-chip modules

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12.1.2 Modes of Operation

Figure 12-2 shows the modes in which the SLIC will operate.

VDD <= VDD (MIN)

(FROM ANY MODE)

ANY MCU RESET SOURCE

ASSERTED

POWER OFF

SLIC RESET

VDD > VDD (MIN) AND ANY

MCU RESET SOURCE ASSERTED

SLIC INIT

REQUESTED

(INITACK = 1)

NO MCU RESET SOURCE ASSERTED

INITREQ = 0; (INITACK = 0)

(FROM ANY MODE)

INITREQ SET TO 1 IN

SLCC1 REGISTER

SLCE CLEARED IN

SLCC2 REGISTER

SLCIE=1 and NETWORK ACTIVITY

OR OTHER MCU

WAKEUP

SLIC DISABLED

SLIC RUN

SLCE SET IN SLCC2 REGISTER

NETWORK ACTIVITY OR OTHER

MCU WAKEUP

SLIC STOP

STOP INSTRUCTION

(WAIT INSTRUCTION

AND SLCWCM = 1)

(WAIT INSTRUCTION

AND SLCWCM = 0)

Figure 12-2. SLIC Operating Modes

SLIC WAIT

12.1.2.1 Power Off

This mode is entered from the reset mode whenever the SLIC module supply voltage VDD drops below its

minimum specified value for the SLIC module to guarantee operation. The SLIC module will be placed in

the reset mode by a system low-voltage reset (LVR) before being powered down. In this mode, the pin

input and output specifications are not guaranteed.

12.1.2.2 Reset

This mode is entered from the power off mode whenever the SLIC module supply voltage VDD rises above

its minimum specified value (VDD(MIN)) and some MCU reset source is asserted. To prevent the SLIC

from entering an unknown state, the internal MCU reset is asserted while powering up the SLIC module.

SLIC reset mode is also entered from any other mode as soon as one of the MCU's possible reset sources

(e.g., LVR, POR, COP, RST pin, etc.) is asserted. SLIC reset mode may also be entered by the user

software by asserting the INITREQ bit. INITACK indicates whether the SLIC module is in the reset mode

as a result of writing INITREQ in SLCC1. While in the reset state the SLIC module clocks are stopped.

Clearing the INITREQ allows the SLIC to proceed and enter SLIC run mode (if SLCE is set). The module

MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3

188

Freescale Semiconductor

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