mc33596 Freescale Semiconductor, Inc, mc33596 Datasheet - Page 16

• Manufacturer Part Number: mc33596
• Description: Pll Tuned Uhf Receiver For Data Transfer Applications
• Manufacturer: Freescale Semiconductor, Inc

Register Access through SPI
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:
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.
16
Strobe Pin
Banks Bit
Strobe Pin
State A
•
•
•
State B
BANKA
Strobe pin connected to an external capacitor to define timing (see
Control”)
Strobe pin can also be connected to the MCU I/O port
SOE bit = 1
X
0
1
BANKB
OFF
0
1
1
OFF
Bank A is active
Bank B is active
Bank A and Bank B are both active, configuration will toggle at each wakeup
State B
MC33596 Data Sheet, Rev. 3
State B
OFF
Section 13, “Receiver On/Off
OFF
State A
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