Toshiba TLCS-900/H1 Series Manual page 470

Original cmos 32-bit microcontroller

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(4) SPI CRC Register (SPICR)

The SPICR register contains the CRC calculation result for transmit/receive data.

(a) CRCD15:0

The CRC result which is calculated according to the settings of the CRC16_7_b,

CRCRX_TX_B and CRCRESET_B bits in the SPICT register are loaded into this

generation. When using the CRC7 algorithm, only the lower seven bits participates in

the CRC generation. The following describes the steps required to calculate the CRC16

for the transmit data.

First, initialize the CRC calculation register by writing a "1" to the CRCRESET_B

bit after programming three bits as follows: CRC16_7_b = "1", CRCRX_TX_B = "0", and

CRCRESET_B = "0".

Then, by writing the transmit data into the SPITD register, complete the

transmission of all bits, for which the CRC should be calculated.

The SPIST<TEND> bit should be checked to confirm whether the reception is

By reading the SPICR register after the transmission is completed, the CRC16 for

the transmit data can be obtained.

Note: The CRC is generated upon data input and output of the TMP92CF30 as illustrated below. The timing of the

CRC comparison should be fully considered when performing Sequential-mode transmit and receive

operation using the FIFOs.

SPICR Register

Figure 3.17.11 SPICR Register

CRC result bits [7:0]

CRC result bits [15:8]

CRC generation timing