Maxim-integrated MAXQ622 Bedienungsanleitung PDF herunterladen (Seite 174)

MAXQ612/MAXQ622 User’s Guide

12-4 Maxim Integrated

This register is used to supply the offset location and control read/write access to the internal USB registers.

Bit 7: USB Register Read/Write Select (USBRW). When this bit is set to 1, the CPU initiates a read operation to the

write operation to the register at offset UADDR[4:0].

Bit 6: USB Busy (UBUSY). This active-high busy flag sets to logic 1 to indicate the start of a USB register read/write

operation. It is held high until the end of the operation.

Bit 5: Reserved. Reads returns zero.

Bits 4 to 0: USB Register Address (UADDR[4:0]). These register bits are used to supply the offset location for

accessing internal USB register. Valid offset locations are listed in the following table:

12.3 USB Peripheral Register Descriptions

The following peripheral registers are used to control the USB functions.

12.3.1 USB Register Address Register

Note: Writes to this register are ignored when UBUSY = 1.

UADDR

USB Register Address Register

M4[04h]

Bit # 7 6 5 4 3 2 1 0

Name USBRW UBUSY — UADDR4 UADDR3 UADDR2 UADDR1 UADDR0

Reset 0 0 0 0 0 0 0 0

Access rw r rw rw rw rw rw rw

OFFSET REGISTER DESCRIPTION

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

1F–15h Reserved No operation

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 254 255

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