Pan Docs, “Pan Docs: Audio Registers”

Cite as: Pan Docs, “Pan Docs: Audio Registers”
Original: https://gbdev.io/pandocs/Audio_Registers.html
sha256: c58ffaa538091112d49a73e7eb5281a0a16573d393b499fc5145847494b3825a
Archived: https://web.archive.org/web/20260627022514/https://gbdev.io/pandocs/Audio_Registers.html
Accessed: 2026-10-21
Licence: CC0-1.0 (the gbdev/pandocs repository's license)
Credit: The Pan Docs authors, begun by Pan of Anthrox and maintained by the gbdev community; see https://github.com/gbdev/pandocs/graphs/contributors.
Notes: Read from the live page as deployed from the pinned master commit. Used for the pulse duty settings and wave RAM.

Cited on

A pulse channel's duty is 12.5%, 25%, 50%, or 75%, and its 8-step waveform is clocked at 1,048,576 Hz divided by $2048 - p$ for an 11-bit period value $p$ , so the tone is $131072 / (2048 - p)$ Hz.	`FF11 — NR11FF13 — NR13`	Wiki
The wave channel loops 32 4-bit samples from wave RAM (`$FF30`-`$FF3F`, 16 bytes, upper nibble first), clocked at 2,097,152 Hz divided by $2048 - p$ , so a full wave repeats at $65536 / (2048 - p)$ Hz. Its output level is 100%, 50%, 25%, or off.	`FF30–FF3F — Wave pattern RAMFF1D — NR33FF1C — NR32Sound Channel 3 — Wave output`	Wiki