參數(shù)資料
型號(hào): MC68HC05JJ6CDWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: ROHS COMPLIANT, SOIC-20
文件頁(yè)數(shù): 41/216頁(yè)
文件大?。?/td> 1763K
代理商: MC68HC05JJ6CDWE
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Analog Subsystem
MC68HC05JJ6/MC68HC05JP6 Rev. 3.2
General Release Specification
Freescale Semiconductor
Analog Subsystem
135
NON-DISCLOSURE
AGREEMENT
REQUIRED
NOTE:
The sample capacitor can be affected by excessive noise created with
respect to the device’s VSS pin such that it may appear to leak down or
charge up depending on the voltage level stored on the sample
capacitor. It is recommended to avoid switching large currents through
the port pins while a voltage is to remain stored on the sample capacitor.
The additional option of adding an offset voltage to the bottom of the
sample capacitor allows unknown voltages near VSS to be sampled and
then shifted up past the comparator offset and the device offset caused
by a single VSS return pin. This offset also provides a means to measure
the internal VSS level, regardless of the comparator offset, to determine
NOFF as described in 8.7 Voltage Measurement Methods. In either
case, the proper mask option must be selected and the VOFF bit must
be set in the ASR. It is not necessary to switch the VOFF bit during
conversions, since the offset is controlled by the HOLD and DHOLD bits
when the VOFF is active. Refer to 8.3 Analog Multiplex Register for
more details on the design and decoding of the sample and hold circuit.
8.12 Port B Interaction with Analog Inputs
The analog subsystem is connected directly to the port B I/O pins without
any intervening gates. It is, therefore, possible to measure the voltages
on port B pins set as inputs or to have the analog voltage measurements
corrupted by port B pins set as outputs.
8.13 Port B Pins as Inputs
All the port B pins will power up as inputs or return to inputs after a reset
of the device, since the bits in the port B data direction register will be
reset.
If any port B pins are to be used for analog voltage measurements, they
should be left as inputs. In this case, not only can the voltage on the pin
be measured, but the logic state of the port B pins can be read from
location $0002.
相關(guān)PDF資料
PDF描述
MC68HC05JJ6CPE 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20
MC68HC05JP6CP 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
MC68HC05JP6CDWE 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC05K0CP 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC05K0DW 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05JJ6CP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JJ6CPE 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JP6 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JP6CDW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JP6CDWE 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers