Precautions - Epson S1C17704 Technical Manual

19 SPI

19.8 Precautions

• Be sure to use 16-bit access instructions for reading/writing from/to the SPI registers (0x4320 to 0x4326). The
SPI registers do not allow reading/writing using 32-bit and 8-bit access instructions.
• Do not access the SPI_CTL register (0x4326), while the SPBSY flag (D2/SPI_ST register) is set to 1 (during
data transfer).
∗ SPBSY: Transfer Busy Flag in the SPI Status (SPI_ST) Register (D2/0x4320)
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EPSON
S1C17704 TECHNICAL MANUAL