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beeper: prescaler 32

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minjaesong
2026-06-20 21:10:28 +09:00
parent 646af9452c
commit 6c9a3fdc1e
4 changed files with 43 additions and 41 deletions
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10
terranmon.txt
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@@ -120,13 +120,13 @@ MMIO
93 RO: Set beeper status (aka upload beeper command)
READING causes the side effect (and returns beeper status — 1 if a tone is currently sounding, 0 otherwise). WRITING DOES NOTHING
94..99 RW: Beeper command
0bPPPPPPPP 0bpppppp_QQ 0bqqAABBCC 0baaaaaaaa 0bbbbbbbbb 0bcccccccc
0bPPPPPPPP 0bC_ppppp_QQ 0bAAABBBCC 0baaaaaaaa 0bbbbbbbbb 0bcccccccc
Master clock: 3579545.4545... Hz with prescaler of 16
Master clock: 3579545.4545... Hz with prescaler of 32
PPPPPPPPpppppp: 14-bit frequency divider, determines pitch.
PPPPPPPPppppp: 13-bit frequency divider, determines pitch.
0: no sound
QQ: note effect
QQ: arpeggiator
00: none
10: two-note arpeggio (rate = 60 Hz)
tick 1: base note at divisor P is played
@@ -140,7 +140,7 @@ MMIO
tick 2: second note at divisor (P - A) is played
tick 3: third note at divisor (P - A - B) is played
tick 4: fourth note at divisor (P - A - B - C) is played
Aa/Bb/Cc: note effect arguments (10-bit divisor delta for arpeggiator; byte 96 has high two bits)
Aa/Bb/Cc: arpeggiator arguments (11-bit divisor delta for arpeggiator; byte 96 has high three bits; byte 95 has MSB for C)
1024..2047 RW: Reserved for integrated peripherals (e.g. built-in status display)