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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
88 of 1269
NXP Semiconductors
UM10503
Chapter 9: LPC43xx Configuration Registers (CREG)
This register should not be reprogrammed by USB system software unless the default
values are incorrect, or the system is restoring the register while returning from a
suspended state.
For details on using the SOF signal, see
Table 56.
USB1 frame length adjust register (USB1FLADJ, address 0x4004 3600) bit
description
Bit
Symbol
Description
Reset
value
Access
5:0
FLTV
Frame length timing value
The frame length is given in the number of high-speed bit
times in decimal format. Each decimal value change to this
register corresponds to 16 high-speed bit times. The SOF
cycle time (number of SOF counter clock periods to
generate a SOF micro-frame length) is equal to 59488 +
value in this field. The default value is decimal 32 (0x20),
which results in a SOF cycle time of 60000.
0x00 = 59488 (= 59488 + 0 x 16)
0x01 = 59504 (= 59488 + 1 x 16)
0x02 = 59520 (= 59488 + 2 x 16)
...
0x1F = 59984 (= 59488 + 31 x 16)
0x20 = 60000 (= 59488 + 32 x 16)
...
0x3E = 60480 (= 59488 + 62 x 16)
0x3F = 60496 (= 59488 + 63 x 16)
0x20
R/W
31:6
-
Reserved
-
-