- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372111 > SAA5542 (NXP Semiconductors N.V.) Enhanced TV microcontrollers with On-Screen Display OSD PDF資料下載
參數(shù)資料
| 型號： | SAA5542 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Enhanced TV microcontrollers with On-Screen Display OSD |
| 中文描述： | 與微控制器在強(qiáng)化電視屏幕顯示OSD |
| 文件頁數(shù)： | 32/100頁 |
| 文件大?。?/td> | 371K |
| 代理商： | SAA5542 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁當(dāng)前第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁
2000 Feb 23
32
Philips Semiconductors
Preliminary specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
10 REDUCED POWER MODES
There are two power saving modes, Idle and Power-down,
incorporated into the 10 page devices. There is an
additional Standby mode incorporated into the 1 page
devices. When utilizing any mode, power to the device
(V
DDP
, V
DDC
and V
DDA
) should be maintained, since power
saving is achieved by clock gating on a section by section
basis.
10.1
Idle mode
During Idle mode, Acquisition, Display and the CPU
sections of the device are disabled. The following
functions remain active:
Memory interface
I
2
C-bus interface
Timer/Counters
Watchdog Timer
Pulse Width Modulators.
To enter Idle mode the IDL bit in the PCON register must
be set. The Watchdog Timer must be disabled prior to
enteringIdletopreventthedevicebeingreset.OnceinIdle
mode,theXTALoscillatorcontinuesto run,buttheinternal
clock to the CPU, Acquisition and Display are gated out.
However, the clocks to the Memory interface, I
2
C-bus
interface, Timer/Counters, Watchdog Timer and Pulse
Width Modulators are maintained. The CPU state is frozen
along with the status of all SFRs, internal RAM contents
are maintained, as are the device output pin values. Since
the output values on RGB and VDS are maintained the
display output must be disabled before entering this mode.
There are three methods available to recover from Idle:
Assertion of an enabled interrupt will cause the IDL bit to
be cleared by hardware, thus terminating Idle mode.
The interrupt is serviced, and following the instruction
RETI, the next instruction to be executed will be the one
after the instruction that put the device into Idle mode.
A second method of exiting Idle is via an interrupt
generated by the SAD DC Compare circuit. When the
device is configured in this mode, detection of an analog
threshold at the input to the SAD may be used to trigger
wake-up of the device i.e. TV Front Panel Key-press.
As above, the interrupt is serviced, and following the
instruction RETI, the next instruction to be executed will
be the one following the instruction that put the device
into Idle.
The third method of terminating Idle mode is with an
external hardware reset. Since the oscillator is running,
the hardware reset need only be active for two machine
cycles (24 clocks at 12 MHz) to complete the reset
operation. Reset defines all SFRs and Display memory
to a predefined state, but maintains all other RAM
values. Code execution commences with the Program
Counter set to ‘0000’.
10.2
Power-down mode
In Power-down mode the XTAL oscillator is stopped.
The contents of all SFRs and Data memory are
maintained,However,thecontentsoftheAuxiliary/Display
memoryarelost. Theport pinsmaintain thevaluesdefined
by their associated SFRs. Since the output values on RGB
and VDS are maintained the display output must be made
inactive before entering Power-down mode.
The Power-down mode is activated by setting the PD bit in
the PCON register. It is advised to disable the Watchdog
Timer prior to entering Power-down.
There are three methods of exiting Power-down:
An external interrupt provides the first mechanism for
waking from Power-down. Since the clock is stopped,
external interrupts need to be set level sensitive prior to
entering Power-down. The interrupt is serviced, and
following the instruction RETI, the next instruction to be
executed will be the one after the instruction that put the
device into Power-down mode.
A second method of exiting Power-down is via an
interrupt generated by the SAD DC Compare circuit.
When the device is configured in this mode, detection of
a certain analog threshold at the input to the SAD may
be used to trigger wake-up of the device i.e. TV Front
Panel Key-press. As above, the interrupt is serviced,
andfollowingtheinstructionRETI,thenextinstructionto
be executed will be the one following the instruction that
put the device into Power-down.
The third method of terminating the Power-down mode
is with an external hardware reset. Reset defines all
SFRs and Display memory, but maintains all other RAM
values. Code execution commences with the Program
Counter set to ‘0000’.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA5530 | Enhanced TV microcontrollers with On-Screen Display OSD |
| SAA5530PS | Enhanced TV microcontrollers with On-Screen Display OSD |
| SAA5531 | Enhanced TV microcontrollers with On-Screen Display OSD |
| SAA5531PS | Enhanced TV microcontrollers with On-Screen Display OSD |
| SAA5532 | Enhanced TV microcontrollers with On-Screen Display OSD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA5542PS/NNNN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD) |
| SAA5542TRI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| SAA5543PS/NNNN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD) |
| SAA5543TRI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| SAA5547PS/NNNN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。