1, the PC sends a character to the microcontroller, MCU receive the characters back to the PC. 2, the PC sends a character to the microcontroller the MCU receive, convert lowercase letters to uppercase letters sent back to the PC, if not a lowercase letter, single-chip loopback character " F" to the PC. 3, from a PC to send a string to the microcontroller, MCU receives uppercase letter " A" after which the number of statistics out, displayed on the digital.

program\Uart_change\main.asm
.......\...........\main.LST
.......\...........\main.OBJ
.......\...........\Uart_change
.......\...........\Uart_change.hex
.......\...........\Uart_change.lnp
.......\...........\Uart_change.M51
.......\...........\Uart_change.Opt
.......\...........\Uart_change.plg
.......\...........\Uart_change.Uv2
.......\...........\Uart_change_Uv2.Bak
.......\Uart_change
.......\.....Counter\main.asm
.......\............\main.LST
.......\............\main.OBJ
.......\............\Uart_Counter
.......\............\Uart_Counter.hex
.......\............\Uart_Counter.lnp
.......\............\Uart_Counter.M51
.......\............\Uart_Counter.Opt
.......\............\Uart_Counter.plg
.......\............\Uart_Counter.Uv2
.......\............\Uart_Counter_Uv2.Bak
.......\Uart_Counter
.......\.....test\main.asm
.......\.........\main.LST
.......\.........\main.OBJ
.......\.........\Uart_test
.......\.........\Uart_test.hex
.......\.........\Uart_test.lnp
.......\.........\Uart_test.M51
.......\.........\Uart_test.Opt
.......\.........\Uart_test.plg
.......\.........\Uart_test.Uv2
.......\.........\Uart_test_Uv2.Bak
.......\Uart_test
program

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