mc33696fje/r2 Freescale Semiconductor, Inc, mc33696fje/r2 Datasheet - Page 37

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

After a POR, the circuit is in state 60 (see
value.
At any time, a low level applied to CONFB forces the finite state machine into state 1, whatever the current
state. This is not always shown in state diagrams, but must always be considered.
18.1 Configuration Mode
The configuration mode is selected by the microcontroller unit (MCU) to write to the internal registers (to
configure the system) or to read them. In this mode, the SPI is a slave. The analog parts (receiver and
transmitter) remain in the state (on, off) they were in prior to entering configuration mode, until a new
configuration changes them. In configuration mode, data can be neither sent nor received. As long as a low
level is applied to CONFB, the circuit stays in State 1, the only state in this mode.
Figure 30
Standby/LVD mode to configuration mode.
Freescale Semiconductor
STROBE
CONFB
•
SEB
Power-on Reset
External signal and internal conditions: see
enter standby/LVD mode.
Standby/LVD Mode
and
…and SOE = 1
See
State 60
Figure 30. First Valid Sequence from Standby/LVD Mode to Configuration Mode
Figure 31
Figure 32
SPI Startup Time
…and DME = 0
describe the two valid sequences for enabling a correct transition from
and STROBE = 0
CONFB = 1,
TRXE = 0,
CONFB = 0
…and SOE = 0
Figure 29. State Machine Overview
See
Figure 33
MC33696 Data Sheet, Rev. 9
Figure
Configuration Mode
Configuration Mode
and STROBE = 0
and MODE = 1
29) and configuration registers’ content is set to the reset
CONFB = 1,
CONFB = 1,
TRXE = 1,
TRXE = 1,
State 30
State 1
Figure 33
…and SOE = 1
See
and
Active Bank Change
(A to B or B to A)
Figure 34
Figure 35
…and DME = 1
for information on how to
…and SOE = 0
See
Figure 35
SPI Deselected
SPI Slave
SPI Master
Receive Mode
Controller
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