-->> UART to PS/2 <<--

PS/2 protocol is IBM with the PS/2 PC to launch the standard, mainly for the keyboard and mouse, IBM did not release PS/2 protocol information, there's PS/2 products are from a number of incomplete, to access the information collated by the design of their own PS/2 protocol is equivalent to complex, and in many places it is difficult for the general customers, there is no need to spend too much energy and so they had nothing to do with the application of the work, UART, I can offer to PS/2 chip, to help customers complete the system design.

PS/2 protocol is a two-way communication on the PC machine, the startup process in the system, PS/2 devices (Slave) and host (Host, could be a BIOS and OS) have a more complicated set-up process to shake hands and state For example, to adjust the keyboard repeat delay (DELAY), and made code rate (RATE), light settings (CapsLock, NumLock and ScroLock), etc., followed by the press of a button the user equipment to the host made a string of code, for example, look out space bar, the issue of the keyboard need to host at least three ma, key code 0x29, lifted Code (0xf0 and 0x29) so that the guide is the key code 0xf0 lifted. As a result, customers design their own system, do not need to care about the details of the PS/2 protocol, but to the UART to PS/2 chip 0x29 ,...( made a string may have more than 0x29, as the keys go determined by the length of time), 0xf0 (that lift, break, press the corresponding button called make), 0x29 and so on, is of course a very convenient.