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参数资料
| 型号： | SAA5491H/NNN |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-318-2, QFP-80 |
| 文件页数： | 46/72页 |
| 文件大小： | 498K |
| 代理商： | SAA5491H/NNN |
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1998 Dec 14
50
Philips Semiconductors
Preliminary specication
Economy teletext and TV microcontrollers
SAA5x9x family
9.22
Clock generator
The oscillator circuit is a single-stage inverting amplifier in
a Pierce oscillator configuration. The circuitry between
XTALIN and XTALOUT is basically an inverter biased to
the transfer point. A crystal must be used as the feedback
element to complete the oscillator circuitry. It is operated in
parallel resonance. XTALIN is the high gain amplifier input
and XTALOUT is the output. To drive the device externally
XTALIN is driven from an external source and XTALOUT
is left open-circuit.
Fig.17 Oscillator circuit.
(1) The values of C1 and C2 depend on the crystal specification:
C1 = C2 = 2CL.
handbook, halfpage
MLC110
XTALOUT
XTALIN
OSCGND
C1
(1)
C2
(1)
Fig.18 Oscillator circuit driven from external source.
handbook, halfpage
MLC111
XTALOUT
XTALIN
OSCGND
external clock
not connected
9.23
Reset signal
The externally applied RESET signal (active HIGH) is
used to initialize the microcontroller core, in addition to the
teletext decoder. However, the teletext decoder
incorporates a separate internal reset function which is
activated on the rising edge of the analog supply pin, VDDA.
The purpose of this internal reset circuit is to initialize the
teletext decoder when returning from the “text standby
mode”.
To ensure correct device operation for both “text standby”
and “power-on” modes, it is recommended that the internal
reset signal is active for between 10 to 15 ms. The RESET
signal should only be applied after the power supplies
(VDDM, VDDA and VDDT) and the external crystal oscillator
have stabilized.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAA5491PS | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496PS | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5497 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
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