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參數(shù)資料
| 型號： | EM78458 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 16-QFN |
| 中文描述： | 8位微控制器的通用產(chǎn)品 |
| 文件頁數(shù)： | 26/57頁 |
| 文件大小： | 854K |
| 代理商： | EM78458 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
32
clear, and the ADIF is set.
3. A/D Sampling Time
The accuracy, linearity, and speed of the successive approximation A/D converter are dependent on
the properties of the ADC and the comparator. The source impedance and the internal sampling
impedance directly affect the time required to charge the sample holding capacitor. The application
program controls the length of the sample time to meet the specified accuracy. Generally speaking,
the program should wait for 1 gs for each K
of the analog source impedance and at least 1 gs for
the low-impedance source. After the analog input channel is selected, this acquisition time must be
done before the conversion can be started.
4. A/D Conversion Time
CKR0 and CKR1 select the conversion time (Tct), in terms of instruction cycles. This allows the MCU
to run at the maximum frequency without sacrificing the accuracy of A/D conversion. For the
EM78458/459, the conversion time per bit is about 4gs. Table 8 shows the relationship between Tct
and the maximum operating frequencies.
Table 9 Tct vs. the Maximum Operation Frequency
CKR0:CKR1
Operation Mode
Max. operation frequency
00
Fsco/4
1 MHz
01
Fsco/16
4 MHz
10
Fsco/64
16MHz
11
Internal RC
1 MHz
5. A/D Operation During Sleep Mode
In order to reduce power consumption, the A/D conversion remains operational during sleep mode,
and is obligated to implement the internal RC clock source mode. As the SLEP instruction is executed,
all the operations of the MCU will stop except for the A/D conversion. The RUN bit will be cleared and
the result will be fed to the ADDATA when the conversion is completed. If the ADIE is enabled, the
device will wake up. Otherwise, the A/D conversion will be shut off, no matter what the status of ADPD
bit is.
6. Programming Steps/Considerations
1. Programming steps
Follow these steps to obtain data from the ADC:
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM78458AM | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
| EM78458AP | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
| EM78459 | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
| EM78459AK | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
| EM78459AM | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
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