In Full Chip Simulation (FCS) mode, this module simulates all functionality of the Serial Peripheral Interface (SPI) module including:
- Flag polling
- Interrupt enabled mode
- 8- or 9-bit length data codes
- Odd and even parity modes
- Transmission and reception of external data
FCS mode uses the buffered input/output structure to simulate SCI inputs. You can queue up to 256 data values into the input buffer. The output buffer of the SCI module can also hold 256 output values. To queue the SCI Input Data, use the SCDI <n> command in the command prompt. If <n> (the data parameter) is given, the value is placed into the next slot in the input buffer.
Otherwise, if no parameter is provided, a window is displayed with the input buffer values. You can enter input values while the window is open. An arrow points to the next value to be used as input to the SCI. The data from the SCI input buffer is written to the SCI data register once the SCI module has been turned on and is properly configured for receiving data from an external serial device. Once the simulation of the data transmission is over, the arrow moves to the next value in the SCI IN Buffer.
SCI Data Output Buffer simulation lets you gain access to the past 256 SCI data values transmitted out of the module. To bring up the SCI OUT buffer dialog box, use the SCDO command.
The SCCLR command may be used at any point to flush the input and output SCI buffers. After the SCI simulated input is received, the first queued value is passed from the data buffer into the SCI data register. It can be observed in the memory window by displaying the memory location corresponding to the SCI data register.
You can also observe different SCI flags in the Memory window. If the module is run in Flag Polling mode, poll the flag corresponding to the expected SCI event. If the SCI interrupts are enabled, the FCS jumps to an appropriate subroutine as long as the SCI interrupt vectors are properly defined.