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HT48R70A-1 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT48R70A-1 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 40 page Pad Description Pad Name I/O Options Description PA0~PA7 I/O Wake-up Pull-high* CMOS or Schmitt Input Bidirectional 8-bit input/output ports Each bit can be configured as a wake-up input by options. Software instruc- tions determine the CMOS output or Schmitt trigger or CMOS input with or with- out pull high resistor (by options). PB0~PB7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). VSS ¾¾ Negative power supply, ground INT I ¾ External interrupt Schmitt trigger without pull high resistor Edge trigger is activated during high to low transition. TMR0 I ¾ Schmitt trigger input for Timer/Event Counter 0 TMR1 I ¾ Schmitt trigger input for Timer/Event Counter 1 PC0~PC7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). RES I ¾ Schmitt trigger reset input, active low VDD ¾¾ Positive power supply OSC1 OSC2 I O Crystal or RC or RTC OSC1 and OSC2 are connected to an RC network or a crystal (by options) for the internal system clock. In the case of RC operation, OSC2 is the output terminal for 1/4 system clock. These two pins also can be optioned as an RTC oscillator (32768Hz). In this case, the system clock comes from an internal RC oscillator whose fre- quency has 4 options (3.2MHz, 1.6MHz, 800kHz, 400kHz) PD0~PD7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). PE0~PE7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). PF0~PF7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). PG0~PG7 I/O Pull-high* Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or Schmitt trigger input (pull-high depends on options). Note: * The pull-high resistors of each I/O port (PA, PB, PC, PD, PE, PF, PG) are controlled by an option. CMOS or Schmitt trigger option of port A is controlled by an option. Absolute Maximum Ratings Supply Voltage ...........................VSS -0.3V to VSS+6.0V Storage Temperature ............................ -50°Cto125°C Input Voltage..............................VSS -0.3V to VDD+0.3V Operating Temperature........................... -40°Cto85°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil- ity. HT48R70A-1/HT48C70-1 Rev. 1.60 5 June 9, 2004 |
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