MC33596_10 Datasheet, PDF (32/70 Pages) Freescale Semiconductor, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Configuration Switching
15.1.2.2 BANKA = 0, BANKB = 1
State B
OFF
State B
OFF
Strobe Pin
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.
15.1.2.3 BANKA = 1, BANK B = 1
State A
OFF
State B
OFF
State A
Strobe Pin
Banks Bit
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.
15.1.3 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 11.3, “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.
BANKA
X
0
1
BANKB
0 Bank A is active
1 Bank B is active
1 Bank A and Bank B are both active, configuration will toggle at each wakeup
The MCU can override strobe oscillator control by controlling the strobe pin level. If MCU I/O port is in
high impedance, the strobe oscillator will control the OFF/ON state of the MC33596. The various
available sequences are described in the following subsections.
MC33596 Data Sheet, Rev. 4
32
Freescale Semiconductor