UM10503
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User manual
Rev. 1.3 — 6 July 2012
701 of 1269
NXP Semiconductors
UM10503
Chapter 26: LPC43xx Ethernet
26.6.20 System time seconds update register
This register contains the lower 32 bits of the seconds field to be written to, added to, or
subtracted from the System Time value.
The System Time - Seconds Update register, along with the System Time - Nanoseconds
Update register, initialize or update the system time maintained by the core. You must
write both of these registers before setting the TSINIT or TSUPDT bits in the Time Stamp
Control register.
26.6.21 System time nanoseconds update register
This register contains 32 bits of the nano-seconds field to be written to, added to, or
subtracted from the System Time value.
Table 552. System time nanoseconds register (NANOSECONDS, address 0x4001 070C) bit
description
Bit
Symbol
Description
Reset
value
Access
30:0
TSSS
Time stamp sub seconds
The value in this field has the sub second representation
of time, with an accuracy of 0.46 nano-second. (When
TSCTRLSSR in the MAC_TIMESTAMP_CTRL register
is set, each bit represents 1 ns and the maximum value
will be 0x3B9A_C9FF, after which it rolls-over to zero).
0
RO
31
PSNT
Positive or negative time
This bit indicates positive or negative time value. If the
bit is reset, it indicates that the time representation is
positive, and if it is set, it indicates negative time value.
(This bit represents the 32nd bit of the nanoseconds
value when the Advance Time Stamp feature is
enabled).
0
RO
Table 553. System time seconds update register (SECONDSUPDATE, address 0x4001 0710)
bit description
Bit
Symbol
Description
Reset
value
Access
31:0
TSS
Time stamp second
The value in this field indicates the time, in seconds, to
be initialized or added to the system time.
0
R/W