MC68HC08AS20 Datasheet, PDF (322/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

20.4.1 BDLC Operating Modes
The BDLC has five main modes of operation which interact with the
power supplies, pins, and rest of the MCU as shown in Figure 20-2.
POWER OFF
V_DD ≤ V_DD (MINIMUM)
V_DD > V_DD (MINIMUM) AND
ANY MCU RESET SOURCE ASSERTED
RESET
ANY MCU RESET SOURCE ASSERTED
FROM ANY MODE
(COP, ILLADDR, PU, RESET, LVR, POR)
NO MCU RESET SOURCE ASSERTED
NETWORK ACTIVITY OR
OTHER MCU WAKEUP
RUN
NETWORK ACTIVITY OR
OTHER MCU WAKEUP
BDLC STOP
STOP INSTRUCTION OR
WAIT INSTRUCTION AND WCM = 1
BDLC WAIT
WAIT INSTRUCTION AND WCM = 0
Figure 20-2. BDLC Operating Modes State Diagram
20.4.1.1 Power Off Mode
For the BDLC to guarantee operation, this mode is entered from reset
mode whenever the BDLC supply voltage, V_DD, drops below its
minimum specified value. The BDLC will be placed in reset mode by
low-voltage reset (LVR) before being powered down. In power off mode,
the pin input and output specifications are not guaranteed.
Advance Information
322
MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor