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MC33389DDWR2 数据表(PDF) 43 Page - Freescale Semiconductor, Inc |
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MC33389DDWR2 数据表(HTML) 43 Page - Freescale Semiconductor, Inc |
43 / 49 page Analog Integrated Circuit Device Data Freescale Semiconductor 43 33389 TYPICAL APPLICATIONS Figure 25. Typical Application Schematic 2 The SBC offers several capabilities to help users debug their application. • External bias of V1 and reset pin • Turn OFF software watchdog in the Stand-by mode • Special debug samples with software watchdog disable at power-up (contact local Motorola representative) DEBUG AND PROGRAM DOWNLOAD INTO FLASH MEMORY While the SBC is powered, it enters Normal Request mode and expects during the 75 ms time period in the NR mode, an SPI trigger word (to enter Normal mode and select the watchdog time period). If this does not occur, the SBC enters the Sleep mode and turns off V1. When the software is debugged, and when using development tools, it is not always easy to make sure these events happen properly. It is thus possible to externally power the V1 line with an external 5.0 V supply, and to force the Reset pin to V1 or to and external 5.0 V. These can be done at nominal voltage and temperature. By doing this, 5.0 V is provided to the MCU VDD and reset lines. Under this condition the SBC is not operational. However, the reset pin is pulled low and is sinking 5 mA to ground. This means, the external circuitry driving reset must have a current capability higher than 5 mA in order to drive the reset in the high-state. DISABLE OF SOFTWARE WATCHDOG IN STAND- BY MODE The software watchdog can be disable in Stand-by mode only. In order to disable it the following operation must be done: • Write to MCR register–data 011 (bit 2, bit 1, bit 0) • Write to MCVR register–data 011 (bit 2, bit 1, bit 0) Then the SBC enters the Stand-by mode without software watchdog. However the V2 can not be turn on, and the CAN cell can not be used. (Wake-up input linked to peripheral circuits: (ex: low speed CAN or LIN transceivers). V1 VBAT V2 RST INT CS MISO MOSI SCK TX RX CANH CANL RTL RTH V3 L0 L1 L2 C5 C6 C1 C2 Rp0 RL RH GND GND CAN 1 SPI VDD INT RESET Auxiliary 5V Auxiliary 12V S0 Rs0 CL0 Ignition CAN bus # 1 CANH CANL RTL RTH RL RH CAN bus # 2 GND INH MC33388 LIN 1k LIN bus GND INH MC33399 +12V VBAT VDD VSUP CAN 2 SCI SPI bus Tx/Rx Tx/Rx 33389 |
类似零件编号 - MC33389DDWR2 |
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类似说明 - MC33389DDWR2 |
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