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I think the interrupt response time is related with the MCU clock and the data transmit frequency of keyboard.I interfaced 8051 to a keyboard in a project before. The response time is ok.
It's turely a very nice baby for the ARM guys. You can use it under
SDT2.5 ,SDT2.51,ADS1.1andADS1.2 with the simple jtag cable.
It is developed by Armjtag, and It's free.Thank Armjtag very much!
Try it soon!
Looks there: https://armjtag.27h.com/