NXP Semiconductors K22F series - Control Register (Usbx_Ctl)

43.4.14 Control register (USBx_CTL)
Provides various control and configuration information for the USB module.
Address: 4007_2000h base + 94h offset = 4007_2094h
Bit 7 6 5 4
Read
JSTATE SE0
TXSUSPENDTOKENB
USY
RESET
Write
Reset
0 0 0 0
Bit
3 2 1 0
Read
HOSTMODEEN RESUME ODDRST USBENSOFEN
Write
Reset
0 0 0 0
USBx_CTL field descriptions
Field Description
7
JSTATE
Live USB differential receiver JSTATE signal
The polarity of this signal is affected by the current state of LSEN .
6
SE0
Live USB Single Ended Zero signal
5
TXSUSPENDTOKENBUSY
In Host mode, TOKEN_BUSY is set when the USB module is busy executing a USB token.
Software must not write more token commands to the Token Register when TOKEN_BUSY is
set. Software should check this field before writing any tokens to the Token Register to ensure
that token commands are not lost.
In Device mode, TXD_SUSPEND is set when the SIE has disabled packet transmission and
reception. Clearing this bit allows the SIE to continue token processing. This bit is set by the
SIE when a SETUP Token is received allowing software to dequeue any pending packet
transactions in the BDT before resuming token processing.
4
RESET
Setting this bit enables the USB Module to generate USB reset signaling. This allows the USB
Module to reset USB peripherals. This control signal is only valid in Host mode
(HOSTMODEEN=1). Software must set RESET to 1 for the required amount of time and then
clear it to 0 to end reset signaling. 1.0.
3
HOSTMODEEN
When set to 1, this bit enables the USB Module to operate in Host mode. In host mode, the
USB module performs USB transactions under the programmed control of the host processor.
2
RESUME
When set to 1 this bit enables the USB Module to execute resume signaling. This allows the
USB Module to perform remote wake-up. Software must set RESUME to 1 for the required
amount of time and then clear it to 0. If the HOSTMODEEN bit is set, the USB module appends
a Low Speed End of Packet to the Resume signaling when the RESUME bit is cleared.
1
ODDRST
Setting this bit to 1 resets all the BDT ODD ping/pong fields to 0, which then specifies the
EVEN BDT bank.
0
USBENSOFEN
USB Enable
Setting this bit enables the USB-FS to operate; clearing it disables the USB-FS. Setting the bit
causes the SIE to reset all of its ODD bits to the BDTs. Therefore, setting this bit resets much
of the logic in the SIE.
When host mode is enabled, clearing this bit causes the SIE to stop sending SOF tokens.
Table continues on the next page...
Memory map/Register definitions
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
1096 NXP Semiconductors