MC33596_10 Datasheet, PDF (29/70 Pages) Freescale Semiconductor, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Configuration Switching
Proposed solutions to verify these conditions are :
— If the receiver does not wake periodically and it is only controlled by the STROBE pin (strobe
oscillator disable SOE = 0), an external pulldown resistor on STROBE is required (see
Figure 43 for a 3 V application schematic).
— If the receiver wakes periodically (strobe oscillator enable SOE = 1), the state of the MCU
pins must be defined first and then a power supply must be applied to the MC33596. A
transistor can be used to control the power supply on the VCCIN pin of the MC33596. This
transistor will be driven by an MCU I/O (see Figure 44 for a 3 V application schematic in
strobe oscillator mode).
2. A high level is applied on STROBE in order to wake the MC33596 and enter receive mode. The
duration of this state should be greater than the sum of lock time parameter 5.9 and 5.10. Refer to
Section 13, “Configuration Mode.”
3. CONFB and SEB must be forced to low level to enter configuration mode. Register values are
writen into the internal registers of the MC33596. Refer to Section 13, “Configuration Mode,”
and to Figure 41.
12
3
VCC ^3V
0
STROBE10
*Refer to
(Section 10) ^{SEB 1}
0
CONFB ¹
0
1
SC LK
0
MOSI ¹
0
MISO ¹
0
N1N0 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Figure 23. Startup sequence
15 Configuration Switching
This feature allows for defining two different configurations using two different banks, and for switching
them automatically during wakeup when using a strobe oscillator, or by means of the strobe pin actuation
by the MCU. This automatic feature may be used only in receiver mode; thus allowing fast switching
between any different possible configurations.
15.1 Bit Definition
Two sets of configuration registers are available. They are grouped in two different banks: Bank A and
Bank B. Two bits are used to define which bank represents the state of the component.
MC33596 Data Sheet, Rev. 4
Freescale Semiconductor
29