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ZBasic System Library 174 ZX Microcontroller Family Resource Usage The I2C routines utilize the I/O Timer to regulate the bit timing for channels 1-4. While sending or receiving I2C data, the corresponding timer busy flag will be True indicating that the I/O Timer is in use. On the ZX-24n, ZX-24p, ZX-24r and ZX-24s, the hardware I2C channel cannot be used while Com2 is open since pin 11 is shared by the SDA signal and TxD for Com2. Compatibility This subroutine is not available in BasicX compatibility mode. See Also CloseI2C, I2CGetByte, I2CPutByte, I2CStart, I2CStop, I2CCmd, OpenI2CSlave