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參數資料
| 型號： | uPSD3234AV-24T6T |
| 廠商： | 意法半導體 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core |
| 中文描述： | 閃存可編程系統(tǒng)設備與8032微控制器內核 |
| 文件頁數： | 65/170頁 |
| 文件大?。?/td> | 2717K |
| 代理商： | UPSD3234AV-24T6T |
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uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
ANALOG-TO-DIGITAL CONVERTOR (ADC)
The analog to digital (A/D) converter allows con-
version of an analog input to a corresponding 8-bit
digital value. The A/D module has four analog in-
puts, which are multiplexed into one sample and
hold. The output of the sample and hold is the in-
put into the converter, which generates the result
via successive approximation. The analog supply
voltage is connected to AV
REF
of ladder resistance
of A/D module.
The A/D module has two registers which are the
control register ACON and A/D result register
ADAT. The register ACON, shown in
Table
47., page 66
, controls the operation of the A/D
converter module. To use analog inputs, I/O is se-
lected by P1SFS register. Also an 8-bit prescaler
ASCL divides the main system clock input down to
approximately 6MHz clock that is required for the
ADC logic. Appropriate values need to be loaded
into the prescaler based upon the main MCU clock
frequency prior to use.
The processing of conversion starts when the
Start Bit ADST is set to '1.' After one cycle, it is
cleared by hardware. The register ADAT contains
the results of the A/D conversion. When conver-
sion is completed, the result is loaded into the
ADAT the A/D Conversion Status Bit ADSF is set
to '1.'
The block diagram of the A/D module is shown in
Figure
35
. The A/D Status Bit ADSF is set auto-
matically when A/D conversion is completed,
cleared when A/D conversion is in process.
The ASCL should be loaded with a value that re-
sults in a clock rate of approximately 6MHz for the
ADC using the following formula:
ADC clock input = (f
OSC
/ 2) / (Prescaler register
value +1)
Where f
OSC
is the MCU clock input frequency
The conversion time for the ADC can be calculat-
ed as follows:
ADC Conversion Time = 8 clock * 8bits * (ADC
Clock) ~= 10.67usec (at 6MHz)
ADC Interrupt
The ADSF Bit in the ACON register is set to '1'
when the A/D conversion is complete. The status
bit can be driven by the MCU, or it can be config-
ured to generate a falling edge interrupt when the
conversion is complete.
The ADSF Interrupt is enabled by setting the ADS-
FINT Bit in the PCON register. Once the bit is set,
the external INT1 Interrupt is disabled and the
ADSF Interrupt takes over as INT1. INT1 must be
configured as if it is an edge interrupt input. The
INP1 pin (p3.3) is available for general I/O func-
tions, or Timer1 gate control.
Figure 35. A/D Block Diagram
AI06627
Input
MUX
ACH0
ACH1
ACH2
ACH3
ACON
INTERNAL BUS
ADAT
AVREF
Ladder
Resistor
D
ecode
S/H
Successive
Approximation
Circuit
Conversion
Complete
Interrupt
相關PDF資料 |
PDF描述 |
|---|---|
| uPSD3234AV-40T1T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3234AV-40T6T | Flash Programmable System Devices with 8032 Microcontroller Core |
| UPSD3233BV | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3233BV-40T6T | Flash Programmable System Devices with 8032 Microcontroller Core |
| uPSD3233BV-40U1T | Flash Programmable System Devices with 8032 Microcontroller Core |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UPSD3234AV-24U1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234AV-24U1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234AV-24U6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234AV-24U6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM |
| UPSD3234AV-40T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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