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T W R - 9 S 1 2 G 1 2 8
J U N E
2 ,
2 0 1 0
U S E R G U I D E
connecting external power to the board if desired. An on-board regulator is used to create the
board operating voltage from this input.
Use of the on-board regulator requires input voltage between +7.V and +27V. However, input
voltage should be kept as low as possible to reduce device self-heating.
CAUTION:
This boards does not apply reverse polarity protection on inputs E1 &
E2. Polarity for each input is clearly marked. Reverse input polarity
will damage the board.
Power Select
Option headers PWR_SEL selects the input power source for the target board.
powered from the Tower System, the OSBDM voltage output is disabled.
Figure 3: PWR_SEL Option Header
When
JP5
PWR_SEL
1
● ● 2
● ●
● ●
Select TWR voltage input
Select OSBDM voltage input (default)
Select on-board regulator input
RESET SWITCH
The RESET switch applies an asynchronous RESET input to the MCU. The RESET switch is
connected directly to the RESET* input on the MCU. Pressing the RESET switch applies a
low voltage level to the RESET* input. A pull-up bias resistor allows normal MCU operation.
LOW VOLTAGE RESET
The MC9S12G128 applies a Power-On Reset (POR) circuit and an internal Low Voltage
Reset (LVR) circuit to ensure proper device operation. The POR circuit holds the MCU in
reset until applied voltage reaches an appropriate level. The LVR forces the device into reset
if input voltage falls too low, protecting against brown-out conditions. A user configurable Low-
Voltage Detect (LVD) with interrupt output is also available. Consult the MC9S12G128
reference manual for details of POR, LVR, and LVD operation.
9
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相关代理商/技术参数
TWR-S12G128 制造商:Freescale Semiconductor 功能描述:TOWER CD S12G128
TWR-S12G128-KIT 功能描述:开发板和工具包 - S08 / S12 TOWER KIT S12G128 RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor
TWR-S12G240 功能描述:TOWER SYSTEM MODULE S12G240 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:S12 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF)
TWR-S12G240-KIT 制造商:Freescale Semiconductor 功能描述:TOWER KIT S12G240 - Boxed Product (Development Kits)
TWR-S12G64 功能描述:开发板和工具包 - 其他处理器 S12G64 Tower Board RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
TWR-S12G64-KIT 制造商:Freescale Semiconductor 功能描述:S12G64 TOWER KIT - Boxed Product (Development Kits)
TWR-S12GN32 功能描述:开发板和工具包 - 其他处理器 TOWER BOARD GUPPY RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
TWR-S12GN32-KIT 功能描述:开发板和工具包 - S08 / S12 TOWARD KIT GUPPY RoHS:否 产品:Development Kits 工具用于评估:MC9S12G128 核心:S12 接口类型:CAN, LIN, RS-232, USB 工作电源电压:5 V 制造商:Freescale Semiconductor