i've downloaded a schematic of k60n512 demo-board and i'm interested in programming and debbuging from USB port. On the board the usb programming/debugging functionality is realized by another microcontroller (S08JM60). Now i understand the tri-state JTAG signals behavoiur, but i don't understand the purpose of UART signals (i.e. T_TXD1 & T_RXD1 with respective enable of 3-state buffers) and TRESET_IN & TRESET_OUT for programming purpose.
Anyone could help me please? Thanks