cs4239 Cirrus Logic, Inc., cs4239 Datasheet - Page 62

• Manufacturer Part Number: cs4239
• Description: Crystalclear? Ortable Isa Audio System Logic
• Manufacturer: Cirrus Logic, Inc.

Wavetable & Volume Control (C8)
Default = 0exxee00
BRES
DMCLK
VCEN
WTEN
VCF1
62
VCIE VCF1
D7
D6
D5 D4
res
Force BRESET low. When set, the
BRESET pin is forced low. Typically
used for power management of pe-
ripheral devices.
Disable MCLK. When set, the MCLK
pin of the CS9236 Wavetable Syn-
thesizer serial interface is forced low
providing a power savings mode.
Volume Control Enable. When set,
the UP, DOWN, and MUTE pins be-
come active and provide hardware
master volume control for the line
outputs. Note that this bit can be in-
itialized at power-up through
Hardware Configuration data, Misc.
Configuration Byte.
Wavetable Serial Port Enable. When,
set, the CS9236 Single-Chip Wave-
table Music Synthesizer serial port
pins are enabled. WTEN can be in-
itialized in the E
Configuration data, Global Configura-
tion byte.
Hardware Volume Control Format.
This bit controls the format of the
UP, DOWN, and MUTE pins. VCF1
is initialized in the E
ware Configuration data, Global
Configuration byte.
0 - MUTE is a momentary button.
1 - MUTE is not used. Pressing the
res
Pressing MUTE toggles between
mute and un-mute. Pressing UP or
DOWN will always un-mute.
up and down buttons simultane-
ously causes the volume to mute.
Pressing up or down singularly will
un-mute.
WTEN
D3
VCEN
D2
2
PROM Hardware
2
PROM Hard-
DMCLK
D1
BRES
D0
VCIE
Power Management (C9)
Default = 0xxxx000
SPORT
DAC2
MIXCD
RESET
RESET
D7
D6
res
CrystalClear Portable ISA Audio System
D5
res
When set, the hardware volume
control pins cause interrupts, when
pressed, on the WSSint pin. The
status is available in CTRLbase+7,
IMV bit.
Powers down DAC2 including FM and
the CS9236 serial interface.
Powers down the analog mixer - with
the exception of MIN, AUX2, and the
line outputs.
software RESDRV is initiated caus-
ing the entire chip to be reset and
placed in its default power-up con-
figuration. Access to all registers on
this chip will be lost, including this
one, since the power-up state for
PnP is all resources unassigned.
Volume Control Interrupt Enable.
Powers down the serial ports.
When this bit goes from a 1 to a 0, a
D4
res
TM
D3
res
MIXCD DAC2
D2
D1
CS4239
DS253PP2
SPORT
D0