Sharp LH79524 - Control Status Register 2 for in EP 1, 2, and 3 (INCSR2); Table 17-32. INCSR2 Register; Table 17-33. INCSR2 Fields

LH79524/LH79525 User’s Guide Universal Serial Bus Device
Version 1.0 17-25
17.2.3.5 Control Status Register 2 for IN EP 1, 2, and 3 (INCSR2)
The INCSR2 register allows software to configure USB access and the function of the
IN_PKT_RDY bit. Software should configure endpoints via INCSR2 before reading the
INCSR1 register.
Table 17-32. INCSR2 Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
RESET 0000000000000000
RW RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD ///
AUTO_SET
ISO
///
USB_DMA_EN
FRC_DATA_TOG
///
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RW RW RW RW RW RO RO RO
ADDR
0xFFFF5000 + 0x048
(with the INDEX register set to IN endpoint 1, 2, or 3)
Table 17-33. INCSR2 Fields
BITS NAME FUNCTION
31:8 /// Reserved Reading returns 0. Write the reset value.
7 AUTO_SET
Auto Set IN_PKT_RDY Bit Auto set the IN_PKT_RDY bit.
1 = IN_PKT_RDY is automatically set to 1, without intervention from software,
each time MAXP data is written. If software writes less than MAXP data, the
IN_PKT_RDY bit must be programmed to 1 by software. When two packets
are in the IN FIFO, IN_PKT_RDY will also be automatically set after the first
packet has been sent, if the second packet is the maximum packet size.
0 = Software must explicitly control the IN_PKT_RDY bit
6ISO
Isochronous Mode Enable Use this bit to enable Isochronous transfers.
1 = Enable the IN endpoint for isochronous transfers
0 = Enable the IN endpoint for bulk or interrupt transfers
5
/// Reserved Reading returns 0. Write the reset value.
4 USB_DMA_EN
USB DMA Enable This bit enables DMA Bulk transfers for the IN endpoint.
1 = FIFO is accessed via the DMA
0 = FIFO is accessed via direct Reads
3 FRC_DATA_TOG
Force Data Toggle This bit can be used to force the endpoint IN data toggle to
switch and the data packet to be cleared from the FIFO, regardless of whether an
ACK was received. This can be used by interrupt IN endpoints that are used to
communicate rate feedback for isochronous endpoints.
1 = Force data toggle
0 = Normal operation
2:0 ///
Reserved Reading returns 0. Write the reset value.