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MCP2221 数据表(PDF) 24 Page - Microchip Technology |
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MCP2221 数据表(HTML) 24 Page - Microchip Technology |
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24 / 80 page ![]() MCP2221 DS20005292B-page 24 2015 Microchip Technology Inc. 3.1.1.1 Responses TABLE 3-2: RESPONSE 1 STRUCTURE Byte Index Function Description Value Effect 0 0x10 Status/Set Parameters – command code echo 1 0x00 Command completed successfully 2 Cancel transfer 0x00 No special operation (i.e., Cancel current I2C/SMBus transfer) 0x10 The current I2C/SMBus transfer was marked for cancellation. The actual I2C/SMBus transfer cancellation and bus release will need some time (a few hundreds of microseconds, depending on the communication speed initially chosen for the canceled transfer) 0x11 The I2C engine (inside MCP2221) was already in Idle mode. The cancellation command had no effect. 30x00 No Set I2C/SMBus communication speed was issued. 0x20 The new I2C/SMBus communication speed is now considered. 0x21 The I2C/SMBus communication speed was not set (e.g., I2C transfer in progress). 4 The divider value given at the same index in the command field Only in the case when the code for establishing a new communication speed is given at Byte Index 3. 0x00 When the communication speed is not being set. 5-7 Don’t care Any value 8 Internal I2C state machine state value 9 Lower byte (16-bit value) of the requested I2C transfer length 10 Higher byte (16-bit value) of the requested I2C transfer length 11 Lower byte (16-bit value) of the already transferred (through I2C) number of bytes 12 Higher byte (16-bit value) of the already transferred (through I2C) number of bytes 13 Internal I2C data buffer counter 14 Current I2C communication speed divider value 15 Current I2C timeout value 16 Lower byte (16-bit value) of the I2C address being used 17 Higher byte (16-bit value) of the I2C address being used 18-21 Don’t care Any value 22 SCL line value – as read from the pin |
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