mc33596 Freescale Semiconductor, Inc, mc33596 Datasheet - Page 15

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

10.3.3 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:
10.3.4 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 MC33596. The various available sequences are
described in the following subsections.
10.3.4.1 BANKA = X, BANKB = 0
If strobe pin is 1, configuration is defined by Bank A, BANKS = 1
If strobe pin is 0, MC33596 configuration is OFF.
If a message is received during State A, current state remains State A up to end of message.
Freescale Semiconductor
Strobe Pin
State A
•
•
•
•
•
•
•
BANKA
BANKA
Strobe pin = V
SOE bit = 0
X
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
Bank B is active
Not allowed in direct switch control
Bank A is active
Bank B is active
Bank A and Bank B are both active, configuration will toggle at each wakeup
CC
MC33596 Data Sheet, Rev. 3
State A
OFF
Register Access through SPI
15