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SCI to SPI Peripheral Communication in V850ES Microcontrollers

Figure 2. Positive-Edge Data Capture

Data Out

Clock

Data-In

Data Capture Strobe

Master/Slave

Data Drive Strobe

Master/Slave

Figure 3. Timing Specifications for Transmit and Receive Operations

2.2 SPI Communication

A typical MCU master with an SPI unit takes a form similar to NEC Electronics CSI units (Figure 4).

The SPI Mode Control Register specifies the transfer operation (Figure 5). When CPHA = 0, the first

edge of SCK is the data capture strobe for the first bit. Therefore, the slave unit must begin driving its

data before the first edge of SCK. The falling edge of SS_B (slave Chip Select) is used to indicate the

start of transmission. The SS_B must toggle high and then low between transmissions.

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