Technical information

CSI to SPI Peripheral Communication in V850ES Microcontrollers

Figure 16. CSI00_SetType4(): Set CSI00 Peripheral for Type 4 Interface

CSI0E0 = 0 (CSIM00.7) to disableCSI0E0 = 0 (CSIM00.7) to disable

CKP0 = 1 (CSIC0.4)

DAP0 = 1 (CSIC0.3) for Type-4

CKP0 = 1 (CSIC0.4)

DAP0 = 1 (CSIC0.3) for Type-4

Return

CSI0E0 = 1 (CSIM00.7) to enableCSI0E0 = 1 (CSIM00.7) to enable

2.6.7 CSI00_SendData(*txbuf, txnum): Start CSI Data Transmission

The CSI00_SendData() routine sets up and starts a transmission operation using CSI00. The txbuf

parameter is a pointer to an array of bytes to transmit, and the txnum parameter is the number of

bytes to transmit.

First the routine stores the parameters passed in local copies used in the MD_INTCSI00 interrupt

service routine. The CSI00_TX_LEN variable is the number of bytes to transmit, and is set to

txnum; CSI00_TX_CNT is the number of bytes sent so far, and is initialized to zero;

CSI00_TX_ADDRESS is the address of the next byte to send, and is initially set to the txbuf

pointer passed.

Figure 17. CSI00_SendData(*txbuf, txnum): Start CSI Data Transmission

Return

CSI00_TX_LEN = txnum

CSI00_TX_CNT = 0

CSI00_TX_ADDRESS = txbuf

CSI00_TX_LEN = txnum

CSI00_TX_CNT = 0

CSI00_TX_ADDRESS = txbuf

SOTB0L = *CSI00_TX_ADDRESS

CSI00_TX_ADDRESS ++

CSI00_TX_CNT ++

SOTB0L = *CSI00_TX_ADDRESS

CSI00_TX_ADDRESS ++

CSI00_TX_CNT ++

Then to start the transmit operation, the first byte pointed to is written to the SOTB0L register. The

write to this register starts the CSI00 peripheral clocking the SCK00 output, shifting data out on the

SO00 output, and clocking data in on the SI00 input. The timing and phase of the data transmission

depends on the transfer type set.