MC33596_10 Datasheet, PDF (34/70 Pages) Freescale Semiconductor, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Register Description
• If strobe pin is 0 the state is OFF.
• If strobe pin is released from 0 while state is OFF, the initial OFF period is completed.
The change of duration of one state (due to the STROBE pin level or a message being received) has no
influence on the timing of the following states (A, B, or OFF).
16 Register Description
This section discusses the internal registers, which are composed of two classes of bits.
• Configuration and command bits allow the MC33596 to operate in a suitable configuration.
• Status bits report the current state of the system.
All registers can be accessed by the SPI. These registers are described below.
At power-on, the POR resets all registers to a known value (in the shaded rows in the following tables).
This defines the MC33596’s default configuration.
16.1 Configuration Registers (Description Bank A only)
Figure 24 describes configuration register 1, CONFIG1.
Bit Name
Reset Value
Access
Bit 7
LOF1
1
R/W
Bit 6
LOF0
0
R/W
Bit 5
Bit 4
Bit 3
Bit 2
CF1
CF0
RESET
SL
0
1
0
0
R/W
R/W
R/W
R/W
Figure 24. CONFIG1 Register
Bit 1
LVDE
0
R/W
Bit 0
CLKE
1
R/W
Addr
$00
Table 8. LOF[1:0] and CF[1:0] Setting Versus Carrier Frequency
Carrier Frequency
304 MHz
315 MHz
426 MHz
434 MHz
868 MHz
915 MHz
LOF1
LOF0
CF1
CF0
0
0
0
0
1
0
0
0
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
RESET is a global reset. The bit is cleared internally, after use.
0 = no action
1 = reset all registers and counters
SL (Switch Level) selects the active level of the SWITCH output pin.
MC33596 Data Sheet, Rev. 4
34
Freescale Semiconductor