Raising P0: Raising P0 is two-way I / O in the 8-bit leaking phase. Each foot is capable of absorbing 8TL statement current. P1 tubular is defined as a high range input when the first 1 is written. P0 can be used for external program data memory. . It can be defined as 8 ranks of data / address. When programming FIASH, the P0 output source code is used when FIASH checks as the input port of the original code. At this time, it should be pulled high from outside P0. <br>Fundraising P1: The P1 mouth is eight bidirectional I / Os that provide pull resistance from the inside. The P1 fundraising buffer can receive the output 4TL statement current. The P1 pipe legs can be written to 1 and then pulled up from the inside to be input. The P1's mouth is pulled down from the outside, so it is a low electric power and normally uses an output current. This is because it is pulled from the inside. During programming and inspection of the plasma, the P1 mouth is received as the 8th address.<br>P2 Fundraising: The P2 mouth is an 8-way I / O that draws resistance from the inside. The P2 buffer can receive and output 4 TL statement currents. When the phrase P2 is written as '1', the tube pulls the resistance from the inside and inputs it. Therefore, when inputting, the P2 terminal's foot is pulled low to the outside to output the current. This is because it is pulled from the inside. The P2 port has 8 digits of the P2 output address when accessing external program memory or an external data memory with a 16-bit address. When the address '1' is given When the external 8-bit address data storage is read and written using the internal advantages, the contents of the special function register are output from the P2 port. The P2 port is an 8-bit address signal and control signal for Flas programming and verification. Call. <br>P3 fundraising: The P3 foot is a bidirectional I / O that pulls resistance from eight interiors. It can output 4 TL statement currents. After the P3 phrase is written to '1', it is dragged from the inside to the high level and used for input. This is because the sphere pulls the output current (IL) up.
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