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| 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： | 6/72页 |
| 文件大小： | 498K |
| 代理商： | SAA5491H/NNN |
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1998 Dec 14
14
Philips Semiconductors
Preliminary specication
Economy teletext and TV microcontrollers
SAA5x9x family
7.3.7
SOFTWARE ADC
Up to 4 successive approximation ADCs can be
implemented in software by making use of the on-chip 8-bit
DAC and multiplexed voltage comparator. The software
ADC uses 4 analog inputs which are multiplexed with
P3.0 to P3.3.
Table 9
ADC input channel selection
The control of the ADC is achieved using the Special
Function Registers SAD and SADB.
SAD.CH1 and SAD.CH0 select one of the four inputs to
pass to the comparator. The other comparator input
comes from the DAC, whose value is set by SAD.SAD7
(MSB) to SAD.SAD4 and SADB.SAD3 to SADB.SAD0
(LSB).
CH1
CH0
INPUT PIN
0
P3.3/ADC3
0
1
P3.0/ADC0
1
0
P3.1/ADC1
1
P3.2/ADC2
The setting of the value SAD.SAD7 to SAD.SAD4 must be
performed at least 1 instruction cycle before the setting of
SAD.ST to ensure comparison is made using the correct
SAD.SAD7 to SAD.SAD4 value.
The output of the comparator is SAD.VHI, and is valid
after 1 instruction cycle following the setting of SAD.ST to
a logic 1.
handbook, halfpage
MULTIPLEXER
P3.0
P3.1
VH1
MGL115
P3.2
P3.3
CH1, CH0
SAD7 to SAD0
REF
+
REF
1D
ST
C1
8-BIT DAC
Fig.4 SAD block diagram.
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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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