mc33696fje/r2 Freescale Semiconductor, Inc, mc33696fje/r2 Datasheet - Page 16

• Manufacturer Part Number: mc33696fje/r2
• Description: Mc33696 Pll Tuned Uhf Transceiver
• Manufacturer: Freescale Semiconductor, Inc

Register Access through SPI
11.3.3 Direct Switch Control
The conditions to enter direct switch control are:
By simply writing BANKA and BANKB, the active bank will be defined:
Defined bank is active after exiting the configuration mode, i.e., CONFB line goes high.
The direct switch control should be used when:
11.3.4 Strobe Pin Switch Control
The conditions to enter strobe pin switch control are:
By simply writing BANKA and BANKB, the active banks will be defined.
The strobe pin will control the OFF/ON state of the MC33696. The various available sequences are
described in the following subsections.
11.3.4.1 BANKA = X, BANKB = 0
If strobe pin is 1, configuration is defined by Bank A, BANKS = 1
If strobe pin is 0, MC33696 configuration is OFF.
If a message is received during State A, current state remains State A up to end of message.
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Strobe Pin
State A
•
•
•
•
•
•
•
•
BANKA
BANKA
Strobe pin = V
SOE bit = 0
X
One or both banks are in transmitter configuration (MODE = 1)
When the strobe oscillator cannot be used to define the switch timing (for example, not periodic)
When strobe pin use is not possible (no sleep mode between the two configurations)
No automatic switching is required and MCU SPI access is possible
Strobe pin: controlled by MCU I/O port
SOE bit = 0
X
0
1
0
1
BANKB
BANKB
0
1
1
0
1
1
OFF
Bank A is active (TX or RX)
Bank B is active (TX or RX)
Not allowed in direct switch control
Bank A is active (TX or RX)
Bank B is active (TX or RX)
Bank A and Bank B are both active, configuration will toggle at each wakeup,
not allowed with MODE = 1
CC
MC33696 Data Sheet, Rev. 9
State A
OFF
Freescale Semiconductor