MAXQ612/MAXQ622 User’s Guide
5-28 Maxim Integrated
REGISTER DESCRIPTION
I2CIE.11 (I2CSPIE) I
2
C STOP Interrupt Enable. Setting this bit to 1 causes an interrupt to the CPU when a
STOP condition is detected (I2CSPI = 1). Clearing this bit to 0 disables the STOP detection
interrupt from generating.
I2CIE.15 to I2CIE.12
Reserved. Reads return 0.
UADDR (04h, 04h) USB Register Address Register (8-bit register) (applicable only for the MAXQ622)
Initialization: This register is cleared to 00h on all forms of reset.
Read/Write Access: Unrestricted read/write access except bit 6, which is read only. This register cannot be
written to when the USB controller is busy (UBUSY = 1).
UDDR.4 to UDDR0
OFFSET REGISTER FUNCTION
00h — Idle—no operation
01h FNADDR Function Address Register
02h USBCN USB Control Register
03h USBCFG USB Configuration Register
04h USBIEN USB Interrupt Enable Register
05h USBINT USB Interrupt Register
06h EPIEN Endpoint Interrupt Enable Register
07h EPINT Endpoint Interrupt Register
08h EPSTL Endpoint Stall Register
09h EPNAK Endpoint NAK Register
0Ah EPCTG Endpoint Clear Data Toggle Register
0Bh EP0BC Endpoint 0 Byte Count Register
0Ch EP1BC Endpoint 1 Byte Count Register
0Dh EP2BC Endpoint 2 Byte Count Register
0Eh EP3BC Endpoint 3 Byte Count Register
0Fh Reserved No operation
10h EP0BUF Endpoint 0 Buffer Register
11h EP1BUF Endpoint 1 Buffer Register
12h EP2BUF Endpoint 2 Buffer Register
13h EP3BUF Endpoint 3 Buffer Register
14h SUDBUF Setup Data Buffer Register
1Fh–15h Reserved No operation
UADDR.5
Reserved. Reads return 0.
UADDR.6 (UBUSY) USB Busy. This active-high busy flag is set to logic 1 to indicate the start of a USB register
read/write operation. It is held high until the end of the operation.
UADDR.7 (USBRW) USB Register Read/Write Select. When this bit is set to 1, the CPU initiates a read
operation to the register at offset UADDR[4:0]. When cleared to 0, the CPU waits for data to
be loaded to UDATA before initiating a write operation to the register at offset UADDR[4:0].
UDATA (05h, 04h) USB Data Register (8-bit register) (applicable only for the MAXQ622)
Initialization: This register is cleared to 00h on all forms of reset.
Read/Write Access: Unrestricted read/write access except when UADDR.UBUSY = 1. This register cannot be
written to when the USB controller is busy (UBUSY = 1).
UDATA.7 to UDATA.0 USB Data Register Bits 7:0. These data register bits are used for supplying data for
supported USB register write operation request and for returning data for USB register read
operation.
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