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When use HT82K68A/HT82K68E I/O pin, are there any special points to note?

April 26, 2017ht82k68a ht82k68e note o Pin Points special

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When use HT82K68A/HT82K68E I/O pin, are there any special points to note?

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• PC0 and PC1 are designed dedicated for PS2 mode. The resistance value of pull-high option is 4.7 Kohm (while 12 Kohm for other I/O lines), and when switch to output mode, PC0 and PC1 are configured as open drain (NMOS output). • PE2 ~ PE4 are open drain (NMOS output). These 3 pins are designed to drive LEDs, the sink capability is smaller thus the external current limit resistor can be omitted • PC2 is pin-shared with external interrupt. By setting PE0 to 1 or 0, user can select the rising or falling edge for interrupt triggering.