USB SFR Description
DCON: Device Control Register
Read/Write
Address: 01H
Default: 0XXX_0X00
System Reset
Bit
Bit Mnemonic Function
Number
Reserved:
7
-
Write zero to this bit.
Reserved:
6
-
Write zero to this bit.
Reserved:
5
-
Write zero to this bit.
Reserved:
4
-
Write zero to this bit.
Reserved:
3
-
Write zero to this bit.
Endpoint 3 Direction:
2
EP3DIR
When this bit is set by FW to enable endpoint 3 to be a TX endpoint.
Endpoint 3 behaves as a RX endpoint when this bit is cleared to ‘0’.
D- Pull-Up Resistor Enable:
1
PUREN
When this bit is set to ‘1’, enable internal D- pull-up resistor. After setting
this bit, the device will act a connection to USB host.
Device USP Connection Pull-Up Enable:
This bit is used by FW to control whether device is connected to upper
host/hub via driving bus SE0. Set ‘1’ to release bus to expose the D-
0
CONPUEN
pull-up resistor. Clear ‘0’ to force bus SE0 to inhibit the D- pull-up
resistor. Default is set to ‘1’ after reset. FW can clear to ‘0’ to disable
connection to upper host/hub.
Note: MPC2F35 do not have EP3DIR, Endpoint 3 is dedicated RX FIFO.
FADDR: USB Function Address Register
Read/Write
Address: 08H
Default: X000_0000
System Reset or USB Reset
Bit
Bit
Function
Number
Mnemonic
Reserved:
7
-
Write zero to this bit.
Function Address:
6:0
A [6:0]
This register holds the address for the USB function. During bus
enumeration, it is written with a unique value assigned by the host.
MEGAWIN
MPC235 Data Sheet
19
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
