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參數資料
| 型號： | SAA5542PS |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | TV Microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD)(帶關閉字幕和全屏顯示的TV控制器) |
| 中文描述： | 電視微控制器與隱藏字幕（CC）和屏幕顯示（OSD）（帶關閉字幕和全屏顯示的電視控制器） |
| 文件頁數： | 30/84頁 |
| 文件大?。?/td> | 318K |
| 代理商： | SAA5542PS |
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2000 Feb 23
30
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
9
REDUCED POWER MODES
There are three power saving modes: Standby, Idle and
Power-down, incorporated into the OSD only device.
When utilizing any of these modes, 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.
9.1
Idle mode
During Idle mode, Acquisition, Display and the Central
ProcessingUnit(CPU)sectionsofthedevicearedisabled.
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
entering the Idle mode to prevent the device being reset.
Once in Idle mode, the crystal oscillator continues to run,
but the internal 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 Red Green Blue (RGB) and the
Video Data Switch (VDS) are maintained the display
output must be disabled before entering this mode.
There are three methods to recover from Idle mode:
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 the Idle mode is via an
interrupt generated by the Software Analog-to-Digital
(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 mode.
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 an initialized state, but maintains all other RAM
values. Code execution commences with the Program
Counter set to ‘0000’.
9.2
Power-down mode
In Power-down mode the crystal 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 mode:
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 the 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’.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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) |
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