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USB-MODEVM Protocol

Do the same with a fast mode I

C device:

[0]0x12

[1]0xA0

[2]0x02

[3]0x05

[4]0xAA

[5]0x55

Now with an SPI device which uses an 8-bit register address:

[0]0x10

[1]0xA0

[2]0x02

[3]0x05

[4]0xAA

[5]0x55

Now, do a 16-bit register address, as found on parts like the TSC2101. Assume the register address

(command word) is 0x10E0:

[0]0x14

[1]0x10→ Note: the I

C address now serves as the MSB of the register address.

[2]0x02

[3]0xE0

[4]0xAA

[5]0x55

In each case, the TAS1020 returns, in an HID interrupt packet, the following:

[0] interface byte | status

status:

REQ_ERROR 0x80

INTF_ERROR 0x40

REQ_DONE 0x20

[1] for I

C interfaces, the I

C address as sent

for SPI interfaces, the read back-data from SPI line for transmission of the corresponding byte

[2] length as sent

[3] for I

C interfaces, the register address as sent

for SPI interfaces, the read-back data from SPI line for transmission of the corresponding byte

[4..60] echo of data packet sent

SLAU267A–December 2008–Revised October 2012 USB-MODEVM Protocol

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