added README.
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avr/modules/uart_hw/README
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avr/modules/uart_hw/README
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This folder contains multiple backends for hardware UART as provided by some AVR devices.
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uart.asm: simple UART code blocking for receiption and transmission
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net_uart.asm: glue to connect NET interface to uart.asm
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uses interrupt for ATTN line, no other interrupts used
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