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1W7500(P) R1 (old version)
Old version W7500(P) is unstable when reset assert to W7500(P) from reset pin.
So there is 50 % probability W7500(P) is not awake when reset asserted.
2W7500(P) R2 (new version)
New version W7500(P) has no reset problem.
W7500(P) working clearly whenever reset asserted.
There is no more different with W7500(P) R1 (old version)
3Design guide for old version W7500(P)
1. Please add “watchdog supervisor chip”when reset switch is needed in
user system.
(Please refer to WIZ750SR schematic, especially 3rd page of schematic of
below link)
schematic is for W7500P, you need to check pin connection if you use W7500
http://wizwiki.net/wiki/lib/exe/fetch.php?media=products:wiz750sr:d
atasheet:wiz750sr_schematic_v1.0_pdf.pdf
2. And you need to add below code when develop a software
Main()
{
*(volatile uint32_t *)(0x41001170) = 0x0002; // 8MHz output (125n)
*(volatile uint32_t *)(0x41002008) = 0x0002; // PAD PA_02 use as CLKOUT
….
}