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HT46R01A Datasheet(PDF) 3 Page - Holtek Semiconductor Inc |
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HT46R01A Datasheet(HTML) 3 Page - Holtek Semiconductor Inc |
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3 / 58 page  Pin Description Pin Name I/O Configuration Options Description PA0/AN0 I/O ¾ Bidirectional single line I/O. The pin can be setup as a wake-up input using the wake-up register. Software instructions determine if the pin is a CMOS output or a Schmitt Trigger input. A pull-high resistor can be connected using the pull-high register. PA0 is pin-shared with the AN0 input pin. The A/D input function is selected via software instructions. If selected as an A/D input, the I/O function and pull-high resistor functions are disabled automatically. PA1/PFD/AN1 I/O ¾ Bidirectional single line I/O. The pin can be setup as a wake-up input using the wake-up register. Software instructions determine if the pin is a CMOS output or a Schmitt Trigger input. A pull-high resistor can be connected using the pull-high register. PA1 is pin-shared with the PFD output and the AN1 in- put pin. The A/D input function is selected via software instructions. If selected as an A/D input, the I/O function, PFD output and pull-high resistor functions are disabled automatically. If the A/D function is not selected the PFD output or I/O function selection is chosen via a bit in the CRTL0 register. PA2/TMR0/AN2 I/O ¾ Bidirectional single line I/O. The pin can be setup as a wake-up input using the wake-up register. Software instructions determine if the pin is a CMOS output or a Schmitt Trigger input. A pull-high resistor can be connected us- ing the pull-high register. PA2 is pin-shared with the TMR0 input and the AN2 input pin. The A/D input function is selected via software instructions. If selected as an A/D input, the I/O function, timer input and pull-high resistor functions are disabled automatically. PA3/INT/AN3 I/O ¾ Bidirectional single line I/O. The pin can be setup as a wake-up input using the wake-up register. Software instructions determine if the pin is a CMOS output or a Schmitt Trigger input. A pull-high resistor can be connected us- ing the pull-high register. PA3 is pin-shared with the INT input and the AN3 input pin. The A/D input function is selected via software instructions. If se- lected as an A/D input, the I/O function, external interrupt input and pull-high resistor functions are disabled automatically. PA4/PWM I/O ¾ Bidirectional single line I/O. The pin can be setup as a wake-up input using the wake-up register. Software instructions determine if the pin is a CMOS output or a Schmitt Trigger input. A pull-high resistor can be connected us- ing the pull-high register. PA4 is pin-shared with the PWM output pin. The PWM output or I/O function selection is chosen via a bit in CTRL0 register. PA6/OSC1 PA5/OSC2 I/O RC, Crystal, RTC or I/O Bidirectional 2-line I/O. The pins can be setup as wake-up inputs using the wake-up register. Software instructions determine if the pins are CMOS out- puts or Schmitt Trigger inputs. Pull-high resistors can be connected using the pull-high register. Configuration options determine if the pins are to be used as oscillator pins or I/O pins. Configuration options also determine which oscillator mode is selected. The four oscillator modes are: 1. Internal RC OSC: both pins configured as I/Os. 2. External crystal OSC: both pins configured as OSC1/OSC2. 3. Internal RC + RTC OSC: both pins configured as OSC2, OSC1. 4. External RC OSC+PA5: PA6 configured as OSC1 pin, PA5 configured as I/O. If the internal RC OSC is selected, the frequency will be fixed at either 4MHz, 8MHz or 12MHz, dependent upon which device is chosen. PA7/RES I PA7 or RES Active low Schmitt trigger reset input or PA7 input. A configuration option determines which function is selected. PA7 has a wake-up function but does not have a pull-high function. VDD ¾¾ Positive power supply VSS ¾¾ Negative power supply, ground Note: Each pin on PA except PA7 can be selected to have a pull-high resistor. HT46R01A Rev. 1.10 3 August 13, 2008 |
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