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i am confused whether lpc23xx has two capture registers CR0 and CR1 in the timer module as given in the user manual 2009 release or has four capture registers CR0, CR1,CR2,CR3 as given in user manual2008
Please quote full manual name and revision - like UM10211 LPC23XX User manual Rev. 01 - 11 March 2008.
But anyway - look at paragrap 23:5 - pin descriptin.
In manual rev. 01 it's called table 23-460. In manual rev. 03 it's called table 23-471.
Hoa may capture pins do they mention for each timer?
It is my guess that both manuals are correct, but that the newer manual is more helpful - if the timer supports four capture registers, but they haven't released any chip that utilizes more than two capture pins, then the last two capture registers are not meaningful.