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HT48F70E Datasheet(PDF) 3 Page - Holtek Semiconductor Inc |
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HT48F70E Datasheet(HTML) 3 Page - Holtek Semiconductor Inc |
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3 / 58 page  Pin Description Pin Name I/O Configuration Option Description PA0~PA7 I/O Pull-high* Wake-up CMOS/Schmitt Trigger Input Bidirectional 8-bit input/output port. Each pin can be configured as a wake-up input by configuration option. Software instructions determine if the pin is a CMOS output or input. Configuration options determine if all pins on this port have pull-high resistors and if the inputs are Schmitt Trigger or non-Schmitt Trigger. PB0/BZ PB1/BZ PB2~PB7 I/O Pull-high* I/O or BZ/BZ Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt Trigger input. A configuration option determines if all pins on this port have pull-high resistors. Pins PB0 and PB1 are pin-shared with BZ and BZ, respectively. PC0~PC7 I/O Pull-high* Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A configuration option determines if all pins on this port have pull-high resistors. PD0~PD7 I/O Pull-high* Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A configuration option determines if all pins on this port have pull-high resistors. PE0~PE7 I/O Pull-high* Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A configuration option determines if all pins on this port have pull-high resistors. PF0~PF7 I/O Pull-high* Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A configuration option determines if all pins on this port have pull-high resistors. PG0~PG7 I/O Pull-high* Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A configuration option determines if all pins on this port have pull-high resistors. INT I ¾ 1-bit external interrupt input. This pin is Schmitt trigger input without pull-high resistor. Edge trigger is activated during high to low transition. TMR0 I ¾ Timer/Event Counter 0 external Schmitt trigger input pin (without pull-high re- sistor). TMR1 I ¾ Timer/Event Counter 1 external Schmitt trigger input pin (without pull-high re- sistor). OSC1 OSC2 I O Crystal or RC OSC1, OSC2 are connected to an external RC network or external crystal, determined by configuration option, for the internal system clock. If the RC system clock option is selected, pin OSC2 can be used to measure the sys- tem clock at 1/4 frequency. RES I ¾ Schmitt Trigger reset input. Active low. VDD ¾¾ Positive power supply VSS ¾¾ Negative power supply, ground Note: 1. Each pin on PA can be programmed through a configuration option to have a wake-up function. 2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration is chosen for a particular port, then all input pins on this port will be connected to pull-high resistors. 3. Configuration options determine if the pins on PA are CMOS inputs or Schmitt trigger inputs. 4. Pins PE4~PE7, PF4~PF7 and PG0~7 only exist on the 64-pin package. On the 48-pin package, these pins are not available. 5. Unbounded pins should be setup as outputs or as inputs with pull-high resistors to conserve power. HT48F70E Rev. 1.30 3 July 29, 2009 |
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