mirror of https://github.com/jscrane/r65emu.git
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
#ifndef __ACIA_H__
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#define __ACIA_H__
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struct acia {
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// status bits returned by operator byte
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//
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static const byte rdrf = 1 << 0;
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static const byte tdre = 1 << 1;
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static const byte dcd = 1 << 2;
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static const byte cts = 1 << 3;
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static const byte fe = 1 << 4;
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static const byte ovrn = 1 << 5;
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static const byte pc = 1 << 6;
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static const byte irq = 1 << 7;
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// control operations (four combinable groups)
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//
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static const byte cd1 = 0x00; // divide by 1
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static const byte cd16 = 0x01; // divide by 16
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static const byte cd64 = 0x02; // divide by 64
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static const byte reset = 0x03; // master reset
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static const byte ws7e2 = 0 << 2; // parity
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static const byte ws7o2 = 1 << 2;
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static const byte ws7e1 = 2 << 2;
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static const byte ws7o1 = 3 << 2;
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static const byte ws8n2 = 4 << 2;
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static const byte ws8n1 = 5 << 2;
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static const byte ws8e1 = 6 << 2;
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static const byte ws8o1 = 7 << 2;
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static const byte lrts_dti = 0 << 5; // /rts, disable trans irq
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static const byte lrts_eti = 1 << 5; // /rts, enable
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static const byte hrts_dti = 2 << 5; // rts, disable
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static const byte lrts_dti_brk = 3 << 5; // /rts, disable, send brk
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static const byte eri = 1 << 7; // enable receive interrupt
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};
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#endif
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