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參數(shù)資料
| 型號： | MM908E621ACDWB/R2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54 |
| 封裝： | 17.90 X 7.50 MM, 0.65 MM PITCH, PLASTIC, SOIC-54 |
| 文件頁數(shù)： | 27/65頁 |
| 文件大小： | 1221K |
| 代理商： | MM908E621ACDWB/R2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
33
908E621
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Figure 16. LIN Interface
TXD Pin
The TXD pin is the MCU interface to control the state of the
LIN transmitter (see Figure 2, page 2). When TXD is LOW,
the LIN pin is low (dominant state). When TXD is HIGH, the
LIN output MOSFET is turned off (recessive state). The TXD
pin has an internal pull-up current source to set the LIN bus
to a recessive state in the event, for instance, if the
microcontroller could not control it during system power-up or
power-down.
RXD Pin
The RXD transceiver pin is the MCU interface, which
reports the state of the LIN bus voltage. LIN HIGH (recessive
state) is reported by a high level on RXD, LIN LOW (dominant
state) by a low level on RXD.
STOP Mode and Wake-up Feature
During STOP mode operation the transmitter of the
physical layer is disabled and the internal pullup resistor is
disconnected from VSUP and a small current source keeps
the LIN pin in recessive state. The receiver is still active and
able to detect wake-up events on the LIN bus line.
If the LIN interrupt is enabled (LINIE bit in the Interrupt
Mask register is set), a dominant level longer than TPROPWL
followed by an rising edge will set the LINIF flag and generate
an interrupt which causes a system wake-up (see Figure 8,
SLEEP Mode and Wake-up Feature
During SLEEP mode operation the transmitter of the
physical layer is disabled, the internal pullup resistor is
disconnected from VSUP, and a small current source keeps
the LIN pin in the recessive state. The receiver is still active
to be able to detect wake-up events on the LIN bus line.
A dominant level longer than TPROPWL followed by an
rising edge will generate a system wake-up (reset) and set
the LINWF flag in the Reset Status register (RSR). Also see
A0 INPUT AND ANALOG MULTIPLEXER
A0 - Analog Input
Input A0 is an analog input used for reading switches, or
as analog inputs for potentiometers, NTC, etc.
A0 is internally connected to the analog multiplexer. This
pin offers a switchable current source. To read the Analog
Input, the pin has to be selected with the SS[3:0] bits in the
A0MUCTL register.
Control
Receiv
er
Wake-up
RXD
TXD
GND
VSUP
Slope
Control
30k
10A
LIN bus
SRS[1:0]
PSON
LINCL
LINIF
Wake-up
Filter
MODE
TESTMODE
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