ht82a836r Holtek Semiconductor Inc., ht82a836r Datasheet - Page 33

• Manufacturer Part Number: ht82a836r
• Description: Usb Audio Mcu
• Manufacturer: Holtek Semiconductor Inc.

Oscillator
The device use crystal oscillator as the system clock
source. Two types of crystal system clock frequencies
can be selected while various clock source options for
the Watchdog Timer are provided for maximum flexibil-
ity.
System Crystal/Ceramic Oscillator
For the 12MHz crystal oscillator configurations, the sim-
ple connection of a crystal across OSC1 and OSC2 will
create the necessary phase shift and feedback for oscil-
lation. For the 6MHz crystal oscillator configuration the
addition of two small value capacitors are required. The
SYSCLK bit in the UCC register determines the system
frequency selection.
Rev. 1.00
PLAY_DATAL_H
PLAY_DATAR_L
PLAY_DATAR_H
RECORD_DATA_L
RECORD_DATA_H 0000 0000
ADRL
ADRH
ADCR
ACSR
PA_WAKE_CTRL
PWMC
PWM0
PWM1
MFI1C
USB_STATE
USVC
* stands for warm reset
u stands for unchanged
x stands for unknown
stands for unimplemented
Register
12MHz Crystal
6MHz Crystal
Crystal
(Power-on)
0000 0000
0000 0000
0000 0000
0000 0000
0100 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
1--- --00
Reset
Operation)
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0100 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
Time-out
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
C1, C2
(Normal
1--- --00
22pF
WDT
NC
RES Reset
Operation)
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0100 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
(Normal
1--- --00
33
Watchdog Timer Oscillator
The WDT oscillator is a fully self-contained free running
on-chip RC oscillator with a typical period of 65 us at 5V
requiring no external components. When the device en-
ters the Power Down Mode, the system clock will stop
running but the WDT oscillator continues to free-run and
to keep the watchdog active. However, to preserve
power in certain applications the WDT oscillator can be
disabled via a configuration option.
RES Reset
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0100 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
1--- --00
(HALT)
Crystal/Ceramic Oscillator
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
Time-Out
(HALT)*
u--- --uu
WDT
USB Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
uuuu uuuu
0000 0000
(Normal)
u--- --uu
HT82A836R
March 20, 2008
USB Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
uuuu uuuu
0000 0000
u--- --uu
(HALT)