Semiconductor Group
6-77
1999-04-01
On-Chip Peripheral Components
C541U
6.4.8.4
Interrupt Transfer
The direction of this transfer is always from the device to the host. The usage is intended for device
polling with programmable rate from 10 ms to 255 ms. A no acknowledge handshake (NACK) is
automatically returned to the host, if the device has currently no interrupt data to transfer.
Software is required to set up the data packet in the USBDRn registers, to set the LEN bit field
according to the data length and to set the TYPE bit field to either 0110
B
(for EP1 interrupt endpoint)
or 0111
B
(for EP2 interrupt endpoint).
Summary of Contents for C541U
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Page 21: ...Semiconductor Group 2 6 1997 10 01 Fundamental Structure C541U ...
Page 37: ...Semiconductor Group 4 6 1997 10 01 External Bus Interface C541U ...
Page 133: ...Semiconductor Group 6 88 1999 04 01 On Chip Peripheral Components C541U ...
Page 163: ...Semiconductor Group 8 8 1997 10 01 Fail Safe Mechanisms C541U ...
Page 185: ...Semiconductor Group 10 14 1997 10 01 OTP Memory Operation C541U ...