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19 lines
390 B
Plaintext
19 lines
390 B
Plaintext
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; test read/write on actoive register (which is 16bit read/write)
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tstadr = 160000
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.asect
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.=1000
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start:
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mov #testadr,r3
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inc r3
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mov r3,r2
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; r2 = 160000, r3 = 160001
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clr (r2) ; 0x0000
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movb #377,(r2) ; 0x0000 -> 0x00ff
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movb #377,(r3) ; 0x00ff -> 0xffff 177777
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movb #0,(r2) ; 0xffff -> 0xff00 177400
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movb #0,(r3) ; 0xff00 -> 0x0000
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halt
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; see logic analyzer trace |