baspara.blogg.se - february 2023

Spi serial flash programmer schematic capture

For other microcontrollers you might need to make some changes. I tested this library only with PIC 16F877A. SPI Library for MPLAB XC8įor making the task simpler, I created a SPI library for MPLAB XC8. For example we can write a data to this register to transmitting it to slave devices and we can read the received data from this register. It is set when the SSPBUF register is written while transmitting the previous word.Īll data read/write operations has to happen with this register. This flag is applicable only in transmit mode.

Bit 7 WCOL : Write collision detect bit.

For reading data from slave device, master has to write some data (dummy) to the slave.

Master Mode : Overflow bit won’t set in master mode as each transmission/reception is initiated by writing to SSPBUF.

This bit must be cleared in the software. You have to read any previous data in the SSPBUF before transmitting data to avoid overflow. Slave Mode : This bit is set when a new byte is received while SSPBUF is holding the previous data.Bit 6 SSPOV : Receive overflow indicator bit.Setting this bit enables the MSSP module for using in SPI or I 2C mode. Bit 5 SSPEN : Synchronous serial port enable.If this bit is 0, idle clock state will be LOW (0) and if it is 1, idle clock state will be HIGH (1). Bit 4 CKP : SPI Clock Polarity select bit.Bit 0 ~ 3 SSPM0 ~ SSPM3 : Synchronous Serial Port Mode Select.SSPCON1 – MSSP Control Register 1 SSPCON1 Register MSSP Module PIC 16F877A Slave Mode : This bit must be set 0 in the slave mode.And if it is set 1, input data is sampled at the end of data output frame. Master Mode : If this bit is set 0, input data is sampled at the middle of the data output frame.Idle state means the status of the line when there is no data transfer, it can be LOW (0) or HIGH (1). And if it is 1, data transmission occurs on transition from active to idle clock state.

If this bit is 0, data transmission occurs on transition from idle to active clock state. This bit is used only in I 2C Mode. So please ignore it. This bit is set once the data reception is complete and it is transferred from SSPSR to SSPBUF register. It is applicable only in receive mode and indicates that the data is ready to read. Bit 0 BF : This is the buffer full status bit.SPI Registers SSPSTAT – MSSP Status Register SSPSTAT Register MSSP Module PIC 16F877A You can configure the MSSP module by using SSPSTAT and SSPCON1 registers. We can do all read write operations through SSPBUF register. It is not directly accessible to the programer. SSPSR is the serial in serial out shift register used to transmit/receive data. SPI Mode MSSP Module Block Diagram – PIC 16F877A