Datasheet

MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
188 Freescale Semiconductor
12.1.2 Modes of Operation
Figure 12-2 shows the modes in which the SLIC will operate.
Figure 12-2. SLIC Operating Modes
12.1.2.1 Power Off
This mode is entered from the reset mode whenever the SLIC module supply voltage V
DD
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 V
DD
rises above
its minimum specified value (V
DD(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
V
DD
> V
DD
(MIN) AND ANY
SLIC RESET
SLIC DISABLED
SLIC RUN
SLIC INIT
REQUESTED
SLIC STOP
SLIC WAIT
MCU RESET SOURCE ASSERTED
POWER OFF
NO MCU RESET SOURCE ASSERTED
SLCE SET IN SLCC2 REGISTER
NETWORK ACTIVITY OR OTHER
MCU WAKEUP
(WAIT INSTRUCTION
AND SLCWCM = 0)
STOP INSTRUCTION
(WAIT INSTRUCTION
AND SLCWCM = 1)
SLCIE=1 and NETWORK ACTIVITY
OR OTHER MCU
WAKEUP
SLCE CLEARED IN
SLCC2 REGISTER
(INITACK = 1)
(FROM ANY MODE)
INITREQ SET TO 1 IN
SLCC1 REGISTER
(FROM ANY MODE)
ANY MCU RESET SOURCE
ASSERTED
V
DD
<= V
DD
(MIN)
INITREQ = 0; (INITACK = 0)