Table 3-1. Generic Control FreeMASTER Page Description
Item
Name
Description
1. System Status Register The System Status Register is always transferred with every SPI transmission and gives a
quick system status overview. It summarizes the status of the Voltage Status Register VSR,
LIN Status Register LINSR, High-Side Status Register HSSR and the Low-Side Status Regis-
ter LSSR.
2. SPI Registers
The SPI Registers Control/Status Array allows direct control of the individual bits of the
SBCLIN SPI registers and indicates their status.
3. Buttons SENDx
Clicking a
SENDx
button will generate the command send SPI data. The SPI data read back
from the device is displayed in the Status Array.
4. Pulse Width Modulation The blue bars serve to change the frequency and duty of the PWM. Parameters are changed
when a user drags and releases a mouse button. Frequency range of the Pulse Width
Modulation is selectable by a drop-down menu.
5. SPI Watchdog
These two buttons show the SPI Watchdog clearing time and offer a Watchdog switch off.
6. Last Error Message
If an error occurs in communication, then the error message is shown.
If the user chooses one of the wake-up capabilities and the wake-up event isn’t configured
correctly, then the user is given notice on what to change to configure the wake-up properly.
If a reset condition is detected, then the user is warned and the control page reverts to the
default state.
7. Graph
The Graph indicator shows analogue voltage from the ADOUT0 and ADOUT1 outputs. The
blue line indicates the voltage on the current sense input in mV, and the blue label calculates
the current through the resistor connected to these inputs. A second line shows the variable in
accordance with the Multiplexer Control Register MUXCR. The actual source of the voltage is
displayed in the red caption of the Graph, and the appropriate axis is readjusted to the actual
units.
8. Wake-up Sources
This section provides three wake-up sources and helps the user to correctly set-up one of the
wake-up events.
9. Variable Watch Pane
The Variable Watch Pane displays the variables assigned to the watch. It displays the current
variable values and allows the user to change them (if enabled in the variable definition). See
FMASTXXX.pdf document available at http://www.freescale.com.
10. Back Button
Clicking the Back button will open the Welcome screen.
FreeMASTER Control Page
KIT33912EVME System Basis Chip with LIN Tranceiver Setup Instructions, Rev. 2.0
Freescale Semiconductor
11
3.4
SPI Registers Control/Status Array
The main control area is the Control/Status Array, which allows the control and read of bits in the SBCLIN SPI registers. There
are two categories of components: controllers (write-only bits) and indicators (read-only bits). The bit categories and conditions
are differentiate by color. See
and text below.
Clicking on a control data change button will update the SPI register value if the appropriate SENDx button is pressed. Value of
the bit is indicated by color.
— bit is not set
— bit is set
Data received from the device is represented in the indicator array. If a
SENDx
button is clicked, then the control register is con-
figured. The status register is located at the same address, and updates the indicator array. Value of the bits are indicated by
color, as follows.
After clicking the
SENDx
button in a row of indicators a command is processed to read the status bits only. Value of the bits are
indicated by color.
— bit is not set
— bit is set
The SPI Registers Control/Status Array allows direct access individual bits. The Control/Status Array displays the names of the
SBCLIN SPI registers. Clicking on any underlined register name opens a window with help text relating to that register.
If the MC33912 device generates an interrupt, then a read of the Interrupt Source Register is automatic and its value is displayed
on the
ISR
register indicators row, so that the user recognizes the interrupt occurring.
