NXP Semiconductors LPC1768 User Manual

UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 282 of 841
NXP Semiconductors
UM10360
Chapter 13: LPC176x/5x USB OTG
13.8.9 OTG Clock Status Register (OTGClkSt - 0x5000 CFF8)
This register holds the clock availability status. When enabling a clock via OTGClkCtrl,
software should poll the corresponding bit in this register. If it is set, then software can go
ahead with the register access. Software does not have to repeat this exercise for every
access, provided that the OTGClkCtrl bits are not disturbed.
13.8.10 I
2
C Receive Register (I2C_RX - 0x5000 C300)
This register is the top byte of the receive FIFO. The receive FIFO is 4 bytes deep. The Rx
FIFO is flushed by a hard reset or by a soft reset (I2C_CTL bit 7). Reading an empty FIFO
gives unpredictable data results.
3 OTG_CLK_EN OTG clock enable 0
0 Disable the OTG clock.
1 Enable the OTG clock.
4 AHB_CLK_EN AHB master clock enable 0
0 Disable the AHB clock.
1 Enable the AHB clock.
31:5 - NA Reserved, user software should not write ones
to reserved bits. The value read from a
reserved bit is not defined.
NA
Table 261. OTG clock control register (OTG_clock_control - address 0x5000 CFF4) bit
description …continued
Bit Symbol Value Description Reset
Value
Table 262. OTG clock status register (OTGClkSt - address 0x5000 CFF8) bit description
Bit Symbol Value Description Reset
Value
0 HOST_CLK_ON Host clock status. 0
0 Host clock is not available.
1 Host clock is available.
1 DEV_CLK_ON Device clock status. 0
0 Device clock is not available.
1 Device clock is available.
2 I2C_CLK_ON I
2
C clock status. 0
0I
2
C clock is not available.
1I
2
C clock is available.
3 OTG_CLK_ON OTG clock status. 0
0 OTG clock is not available.
1 OTG clock is available.
4 AHB_CLK_ON AHB master clock status. 0
0 AHB clock is not available.
1 AHB clock is available.
31:5 - NA Reserved, user software should not write ones
to reserved bits. The value read from a
reserved bit is not defined.
NA

NXP Semiconductors LPC1768 Specifications

General

Brand	NXP Semiconductors
Model	LPC1768
Category	Microcontrollers
Language	English