Usb Interrupt - Renesas M16C Series User Manual

M30245 Group

2.8.3 USB Interrupt

The USB related interrupts include USB suspend interrupt, USB resume interrupt, USB reset interrupt,
USB endpoint 0 interrupt, USB function interrupt, and USB SOF interrupt.
(1) Related Registers
USB function interrupt status register
This register is used to judge the USB function interrupt factor. This is the read-only register which
indicates each interrupt request state of endpoint x(x=1~4) IN interrupt, endpoint x(x=1~4) OUT inter-
rupt, and error interrupt. On occurrence of an interrupt request, this is set to "1". Each interrupt status
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flag can be cleared to "0" by setting "1" to the corresponding bit of USB function interrupt clear register.
• Endpoint 1 IN Interrupt Status Flag
• Endpoint 2 IN Interrupt Status Flag
• Endpoint 3 IN Interrupt Status Flag
• Endpoint 4 IN Interrupt Status Flag
These flags indicate endpoint x(x=1~4) IN interrupt request state, respectively. These flags are set to
"1" at the corresponding endpoint that has been enabled by USB function interrupt enable register in
the following cases:
- The endpoint is enabled from a disabled state
- One buffer data is successfully transmitted
- Buffer flush has been executed by either AUTO_FLUSH or FLUSH bit (bit 6 at address EPxICS)
being set to "1" while buffer data exists in the IN FIFO.
• Endpoint 1 OUT Interrupt Status Flag
• Endpoint 2 OUT Interrupt Status Flag
• Endpoint 3 OUT Interrupt Status Flag
• Endpoint 4 OUT Interrupt Status Flag
These each indicate endpoint x(x=1~4) OUT interrupt request state. When a data is successfully
received, these flags are set to "1" at the corresponding endpoint.
• Error Interrupt Status Flag
This flag indicates that an error has been occurred at the endpoint x(x=0~4). This flag is set to "1" in
the following cases:
- The EP0CSR4 (FORCE_STALL) flag of endpoint 0 is set to "1"
- The EP0CSR5 (SETUP_END) flag of endpoint 0 is set to "1"
- The INxCSR2 (UNDER_RUN) flag of endpoint 1 to 4 IN is set to "1"
- The OUTxCSR2 (OVER_RUN) flag of endpoint 1 to 4 OUT is set to "1"
- The OUTxCSR3 (FORCE_STALL) flag of endpoint 1 to 4 OUT is set to "1"
- The OUTxCSR4 (DATA_ERR) flag of endpoint 1 to 4 OUT is set to "1"
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
page 150 of 354
2. USB function