SH7670 Datasheet, PDF (462/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 12 Ethernet Controller (EtherC)
12.6 Usage Notes
• Conditions for Setting LCHNG Bit
Even if the level of the signal input to the LNKSTA pin is not changed, the LCHNG bit in
ECSR may be set. It may happen when the pin function is changed from port to LNKSTA by
PCCRH2 of the PFC or when a software reset caused by the SWR bit in EDMR is cleared
while the LNKSTA pin is being driven high.
This is because the LNKSTA signal is internally fixed low when the pin functions as a port or
during the software reset state regardless of the external pin level.
Clear the LCHNG bit before setting the LCHNGIP bit in ECSIPR not to request a LINK signal
changed interrupt accidentally.
Rev. 1.00 Nov. 14, 2007 Page 436 of 1262
REJ09B0437-0100