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MC33596 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc |
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MC33596 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc |
16 / 58 page MC33596 Data Sheet, Rev. 3 Register Access through SPI Freescale Semiconductor 16 10.3.4.2 BANKA = 0, BANKB = 1 If strobe pin is 1, configuration is defined by Bank B, BANKS = 0. If strobe pin is 0, MC33596 configuration is OFF. If a message is received during State B, current state remains State B up to end of message. 10.3.4.3 BANKA = 1, BANK B = 1 If strobe pin is 1, configuration is defined by BANKS. BANKS is toggled at each falling edge of the strobe pin. If strobe pin is 0, MC33596 configuration is OFF. If a message is received during state A or state B, current state remains the same up to end of message. If a read or write access is done using SPI, the next sequence will begin with state A whatever was the active state before SPI access by MCU. 10.3.5 Strobe Oscillator Switch Control The conditions to enter strobe oscillator switch control are: • Strobe pin connected to an external capacitor to define timing (see Section 13, “Receiver On/Off Control”) • Strobe pin can also be connected to the MCU I/O port • SOE bit = 1 By simply writing BANKA and BANKB, the active banks will be defined. MCU can override strobe oscillator control by controlling strobe pin level. If MCU I/O port is in high impedance, strobe oscillator will control the OFF/ON state of the MC33596. The various available sequences are described in the following subsections. BANKA BANKB X 0 Bank A is active 0 1 Bank B is active 1 1 Bank A and Bank B are both active, configuration will toggle at each wakeup OFF Strobe Pin State B OFF State B Strobe Pin Banks Bit State A OFF State B OFF State A |
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