
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
908E624
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
908E624 ANALOG DIE MODES OF OPERATION
The 908E624 offers three operating modes: Normal (Run),
Stop, and Sleep. In Normal mode the device is active and is
operating under normal application conditions. The Stop and
Sleep modes are low-power modes with wake-up
capabilities.
In Stop mode, the voltage regulator still supplies the MCU
with VDD (limited current capability), and in Sleep mode the
voltage regulator is turned off (VDD = 0 V).
Wake-up from Stop mode is initiated by a wake-up
interrupt. Wake-up from Sleep mode is done by a reset and
the voltage regulator is turned back on.
The selection of the different modes is controlled by the
MODE1:2 bits in the SPI Control register.
Figure 11 describes how transitions are done between the
overview of the operating mode.
Figure 11. Operating Modes and Transitions
Reset
Power
Down
Notes:
WD - means Watchdog
WD disabled - means Watchdog disabled (WDCONF terminal connected to GND)
WD trigger – means Watchdog is triggered by SPI command
WD failed – means no Watchdog trigger or trigger occurs in closed window
STOP Command - means STOP command sent via SPI
SLEEP Command - means SLEEP command send via SPI
Wake-Up - means L1 or L2 state change or LIN bus wake up or SS rising edge
Normal
Request
VDD High and Reset Delay (tRST) expired
Normal
Normal Request timeout expired (NRTOUT)
W
D
tri
gge
r
Sleep
Wake-Up (Reset)
Stop
VDD Low
VDD Low (>NRTOUT) expired
and VSUV = 0
SLEEP Command
VDD Low
S
T
O
P
Comm
and
W
ak
e-U
pInt
e
rru
p
t
WD
dis
a
b
led
VDD Low
WD failed
Normal Request Timeout Expired (tNRTOUT)
VDD High and
Reset Delay (tRST) Expired
VDD Low
WD Failed
VDD LOW (>tNRTOUT) Expired
and LVF = 0
Sleep Command
St
op
Comma
nd
Wake-up (Reset)
W
D
Tr
igge
r
W
D
isa
bled
Power Up
W
a
ke-
up
Inter
rupt
Legend
WD: Watchdog
WD Disabled: Watchdog disabled (WDCONF pin connected to GND)
WD Trigger: Watchdog is triggered by SPI command
WD Failed: No watchdog trigger or trigger occurs in closed window
Stop Command: Stop command sent via SPI
Sleep Command: Sleep command sent via SPI
Wake-up: L1 or L2 state change or LIN bus wake-up or SS rising edge
VDD Low