MC68HC08AS32A Datasheet, PDF (66/296 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Byte Data Link Controller-Digital (BDLC-D)
4.3.1 BDLC Operating Modes
The BDLC has five main modes of operation which interact with the power
supplies, pins, and the remainder of the MCU as shown in Figure 4-4.
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 4-4. BDLC Operating Modes State Diagram
4.3.1.1 Power Off Mode
This mode is entered from reset mode whenever the BDLC supply voltage, V_DD,
drops below its minimum specified value for the BDLC to guarantee operation. The
BDLC will be placed in reset mode by low-voltage reset (LVR) before being
powered down. In this mode, the pin input and output specifications are not
guaranteed.
4.3.1.2 Reset Mode
This mode is entered from the power off mode whenever the BDLC supply voltage,
V_DD, rises above its minimum specified value (V_DD –10%) and some MCU reset
source is asserted. The internal MCU reset must be asserted while powering up
the BDLC or an unknown state will be entered and correct operation cannot be
guaranteed. Reset mode is also entered from any other mode as soon as one of
Data Sheet
66
Byte Data Link Controller-Digital (BDLC-D)
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MC68HC08AS32A — Rev. 1
MOTOROLA