MC33596FCESLASHR2 datasheet(29/70 Pages) FREESCALE

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Configuration Switching

MC33596 Data Sheet, Rev. 4

Freescale Semiconductor

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.

Figure 23. Startup sequence

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.

SEB

CONFB

SCLK

MOSI

MISO

D7 D6 D5 D4 D3 D2 D1 D0

N1N0 A4 A3 A2 A1 A0 R/W

STROBE

VCC

SEB

CONFB

SCLK

MOSI

MISO

D7 D6 D5 D4 D3 D2 D1 D0

N1N0 A4 A3 A2 A1 A0 R/W

STROBE

VCC

*Refer to

(Section 10)

MC33596FCE/R2 Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc

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