[help] Questions on Timer 2 in 8052

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Hi all,
I have some problem with Timer 2 in 8052. I use Winbond W77e58 with
40M clock, whose machine cycle has 4 osc clocks.
1. When use Timer 2 as baud rate generator, with T2 pin as clock
source, what is maximum counting rate, i.e., the maximum clock
frequency can be provided to T2 pin? 1/24 of the f_osc, or 1/8, or any
value else?
2. When use Timer 2 in capture mode and use negative transition of
T2EX pin to capture the TH2/TL2, what is the minimum signal width of
the negative pulse?

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