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STC12LE5616AD Datasheet(PDF) 78 Page - STCmicro Technology Co,.Ltd |
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STC12LE5616AD Datasheet(HTML) 78 Page - STCmicro Technology Co,.Ltd |
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78 / 377 page  4.7 How to make I/O port low after MCU reset Traditional 8051 MCU power-on reset, the general IO port are weak pull-high output, while many practical applications require IO port remain low level after power-on reset, otherwise the system malfunction would be generated. For STC12C5620AD series MCU, IO port can add a pull-down resistor (1K/2K/3K), so that when power-on reset, although a weak internal pull-up to make MCU output high, but because of the limited capacity of the internal pull-up, it can not pull-high the pad, so this IO port is low level after power-on reset. If the I/O port need to drive high, you can set the IO model as the push-pull output mode, while the push-pull mode the drive current can be up to 20mA, so it can drive this I/O high. I/O 1K/2K/3K More then 470ohm 4.8 I/O status while PWM outputing When I/O is used as PWM port, it’s status as bellow: Before PWM output While PWM outputing Quasi-bidirectional Push-Pull (Strong pull-high need 1K~10K limiting resistor) Push-Pull Push-Pull (Strong pull-high need 1K~10K limiting resistor) Input ony (Floating) PWM Invalid Open-drain Open-drain common I/O port To load current limiting resistor between 10K and 1K 78 |
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