Nintendo DMG-01 Manual - Page 46

FF1C NR 32, FF1D NR 33, FF1E NR 34

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2.13.1. I/O Registers Game BoyTM CPU Manual 20. FF1C (NR 32) Name - NR 32 Contents - Sound Mode 3 register, Select output level (R/W) Only bits 6-5 can be read Bit 6-5 - Select output level 00: Mute 01: Produce Wave Pattern RAM Data as it is(4 bit length) 10: Produce Wave Pattern RAM data shifted once to the RIGHT (1/2) (4 bit length) 11: Produce Wave Pattern RAM data shifted twice to the RIGHT (1/4) (4 bit length) * - Wave Pattern RAM is located from $FF30-$FF3f. 21. FF1D (NR 33) Name - NR 33 Contents - Sound Mode 3 register, frequency's lower data (W) Lower 8 bits of an 11 bit frequency (x). 22. FF1E (NR 34) Name - NR 34 Contents - Sound Mode 3 register, frequency's higher data (R/W) Only bit 6 can be read. Page 46 V 1.01

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2.13.1. I/O Registers
Game Boy
TM
CPU Manual
20.
FF1C (NR 32)
Name
- NR 32
Contents - Sound Mode 3 register, Select output
level (R/W)
Only bits 6-5 can be read
Bit 6-5 - Select output level
00: Mute
01: Produce Wave Pattern RAM
Data as it is(4 bit length)
10: Produce Wave Pattern RAM
data shifted once to the
RIGHT (1/2)
(4 bit length)
11: Produce Wave Pattern RAM
data shifted twice to the
RIGHT (1/4)
(4 bit length)
* - Wave Pattern RAM is located from $FF30-$FF3f.
21.
FF1D (NR 33)
Name
- NR 33
Contents - Sound Mode 3 register, frequency's
lower data (W)
Lower 8 bits of an 11 bit frequency (x).
22.
FF1E (NR 34)
Name
- NR 34
Contents - Sound Mode 3 register, frequency's
higher data (R/W)
Only bit 6 can be read.
Page 46
V 1.01