UM10375 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 3 — 14 June 2011 154 of 368
NXP Semiconductors
UM10375
Chapter 10: LPC13xx USB device controller
1. Command phase: the USBCmdCode register is written with the CMD_PHASE field
set to the value 0x05 (Command), and the CMD_CODE field set to the desired
command code. On completion of the command, the CCEMPTY bit of USBDevIntSt is
set.
2. Data phase (optional): for writes, the USBCmdCode register is written with the
CMD_PHASE field set to the value 0x01 (Write), and the CMD_WDATA field set with
the desired write data. On completion of the write, the CCEMPTY bit of USBDevIntSt
is set. For reads, USBCmdCode register is written with the CMD_PHASE field set to
the value 0x02 (Read), and the CMD_CODE field set with command code the read
corresponds to. On completion of the read, the CDFULL bit of USBDevInSt will be set,
indicating the data is available for reading in the USBCmdData register. In the case of
multi-byte registers, the least significant byte is accessed first.
An overview of the available commands is given in Table 175
.
Here is an example of the Read Current Frame Number command (reading 2 bytes):
USBDevIntClr = 0x30; // Clear both CCEMPTY & CDFULL
USBCmdCode = 0x00F50500; // CMD_CODE=0xF5, CMD_PHASE=0x05(Command)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10; // Clear CCEMPTY interrupt bit.
USBCmdCode = 0x00F50200; // CMD_CODE=0xF5, CMD_PHASE=0x02(Read)
while (!(USBDevIntSt & 0x20)); // Wait for CDFULL.
USBDevIntClr = 0x20; // Clear CDFULL.
CurFrameNum = USBCmdData; // Read Frame number LSB byte.
USBCmdCode = 0x00F50200; // CMD_CODE=0xF5, CMD_PHASE=0x02(Read)
while (!(USBDevIntSt & 0x20)); // Wait for CDFULL.
Temp = USBCmdData; // Read Frame number MSB byte
USBDevIntClr = 0x20; // Clear CDFULL interrupt bit.
CurFrameNum = CurFrameNum | (Temp << 8);
Here is an example of the Set Address command (writing 1 byte):
USBDevIntClr = 0x10; // Clear CCEMPTY.
USBCmdCode = 0x00D00500; // CMD_CODE=0xD0, CMD_PHASE=0x05(Command)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10; // Clear CCEMPTY.
USBCmdCode = 0x008A0100; // CMD_WDATA=0x8A(DEV_EN=1, DEV_ADDR=0xA),
// CMD_PHASE=0x01(Write)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10; // Clear CCEMPTY.
Table 175. SIE command code table
Command name Recipient Code (Hex) Data phase
Device commands
Set Address Device D0 Write 1 byte
Configure Device Device D8 Write 1 byte
Set Mode Device F3 Write 1 byte
Read Interrupt Status Device F4 Read 1 or 2 bytes
Read Current Frame Number Device F5 Read 1 or 2 bytes
Read Chip ID Device FD Read 2 bytes
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