MC33696MOD434EV Freescale Semiconductor, MC33696MOD434EV Datasheet - Page 30

• Manufacturer Part Number: MC33696MOD434EV
• Description: MCU, MPU & DSP Development Tools MC33696 (ECHO) RF C EVAL
• Manufacturer: Freescale Semiconductor

Specifications of MC33696MOD434EV

• Processor To Be Evaluated: MC9S08RG60
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power-On Reset and MC33696 Startup
Figure 23
mode.
16
The startup sequence can be divided into three stages as defined in
30
STROBE
CONFB
STROBE
STROBE
CONFB
CONFB
SEB
SEB
SCLK
SCLK
MOSI
MOSI
1. MC33696 is in receive mode.
2. CONFB is forced to low level during one digital period T
3. CONFB is set to high level during the time length of an ID.
1. The power supply is applied to the MC33696 and an external pullup resistor on CONFB is required
SEB
only.
to enter standby mode. SEB can be either set to low level if the SPI access is not shared with
another external MCU, or connected to an external pullup resistor (see
Interface”).
During this stage and during the ramp-up of the power supply, signals from the MCU connected to
the MC33696 are undefined. That is why the MC33696 must start in standby mode.
— Power supply of the MC33696 must rise in 1 ms from 0 V to 3 V.
— The level on STROBE pin is lower than 0.75 V until the power supply reaches 3 V.
Power-On Reset and MC33696 Startup
describes the sequence for enabling a correct transition from receive mode to configuration
Along with the ramp-up of power supply, one of these two conditions must
be complied with:
Figure 22. Valid Sequence from Standby/LVD Mode to Configuration Mode
SPI Startup Time
Figure 23. Valid Sequence from Receive Mode to Configuration Mode
1
1
2
2
3
3
MC33696 Data Sheet, Rev. 12
NOTE
digclk
Figure
in order to reset the state machine
24:
Section 10, “MCU
Freescale Semiconductor