mirror of
https://github.com/jonthomasson/retro1.git
synced 2024-06-10 05:29:33 +00:00
69 lines
1.9 KiB
Plaintext
69 lines
1.9 KiB
Plaintext
; CPU frequency
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F_CPU = 1000000
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; ACIA registers
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ACIA_BASE = $A000
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ACIA_DATA = ACIA_BASE
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ACIA_STATUS = ACIA_BASE + 1
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ACIA_COMMAND = ACIA_BASE + 2
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ACIA_CONTROL = ACIA_BASE + 3
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; ACIA control register bit values
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ACIA_STOP_BITS_1 = %00000000
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ACIA_STOP_BITS_2 = %10000000
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ACIA_DATA_BITS_8 = %00000000
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ACIA_DATA_BITS_7 = %00100000
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ACIA_DATA_BITS_6 = %01000000
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ACIA_DATA_BITS_5 = %01100000
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ACIA_CLOCK_EXT = %00000000
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ACIA_CLOCK_INT = %00010000
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ACIA_BAUD_16XEXT = %00000000
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ACIA_BAUD_50 = %00000001
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ACIA_BAUD_75 = %00000010
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ACIA_BAUD_109 = %00000011
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ACIA_BAUD_134 = %00000100
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ACIA_BAUD_150 = %00000101
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ACIA_BAUD_300 = %00000110
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ACIA_BAUD_600 = %00000111
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ACIA_BAUD_1200 = %00001000
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ACIA_BAUD_1800 = %00001001
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ACIA_BAUD_2400 = %00001010
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ACIA_BAUD_3600 = %00001011
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ACIA_BAUD_4800 = %00001100
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ACIA_BAUD_7200 = %00001101
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ACIA_BAUD_9600 = %00001110
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ACIA_BAUD_19200 = %00001111
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; ACIA command register bit values
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ACIA_PARITY_ODD = %00000000
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ACIA_PARITY_EVEN = %01000000
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ACIA_PARITY_MARK = %10000000
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ACIA_PARITY_SPACE = %11000000
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ACIA_PARITY_DISABLE = %00000000
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ACIA_PARITY_ENABLE = %00100000
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ACIA_ECHO_DISABLE = %00000000
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ACIA_ECHO_ENABLE = %00010000
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ACIA_TX_INT_DISABLE_RTS_HIGH = %00000000
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ACIA_TX_INT_ENABLE_RTS_LOW = %00000100
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ACIA_TX_INT_DISABLE_RTS_LOW = %00001000
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ACIA_TX_INT_DISABLE_BREAK = %00001100
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ACIA_RX_INT_ENABLE = %00000000
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ACIA_RX_INT_DISABLE = %00000010
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ACIA_DTR_HIGH = %00000000
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ACIA_DTR_LOW = %00000001
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; ACIA status register bit masks
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ACIA_STATUS_IRQ = 1 << 7
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ACIA_STATUS_DSR = 1 << 6
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ACIA_STATUS_DCD = 1 << 5
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ACIA_STATUS_TX_EMPTY = 1 << 4
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ACIA_STATUS_RX_FULL = 1 << 3
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ACIA_STATUS_OVERRUN = 1 << 2
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ACIA_STATUS_FRAME_ERR = 1 << 1
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ACIA_STATUS_PARITY_ERR = 1 << 0
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