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HT56R644 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT56R644 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 108 page  Pin Description The following table depicts the pins common to all devices. Pin Name I/O Configuration Option Description PA0/BZ PA1/BZ PA2 PA3/PFD PA4 or PA4/TMR1 or PA4/TMR2 PA5~PA7 I/O BZ/BZ PFD Bidirectional 8-bit input/output port. Each individual bit on this port can be configured as a wake-up input using the PAWU register. Software instruc- tions determine if the pin is a CMOS output or Schmitt trigger input. A pull-high resistor can be connected to each pin using the PAPU register. Pins PA0, PA1 and PA3 are shared with BZ, BZ and PFD respectively, the function of which is chosen via configuration option. Pins PA0~PA3 can also be setup as open drain pins using the MISC register. The HT56R642 has no shared pins with PA4. Pin PA4 is shared with TMR1 on the HT56R62 and with TMR2 on the HT56R65, HT56R654, HT56R656 and HT56R666. PB0/AN0~ PB7/AN7 or PB0/AN0~ PB5/AN5 I/O ¾ Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A pull-high resistor can be con- nected to each pin using the PBPU register. PB is pin-shared with the A/D in- put pins. The A/D inputs are selected via software instructions. Once selected as an A/D input, the I/O function and pull-high resistor selections are disabled automatically. HT56R62 has six PB pins, PB0/AN0~PB5/AN5 only. PD0/PWM0~ PD3/PWM3 PD4/INT0 PD5/INT1 PD6/TMR0 PD7/TMR1 I/O ¾ Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt trigger input. A pull-high resistor can be con- nected to each pin using the PDPU register. The PWM outputs, PWM0~PWM3, are pin shared with pins PD0~PD3, the function of which is chosen using the PWM registers. Pins PD4~PD7 are pin-shared with INT0, INT1, TMR0 and TMR1 respectively. HT56R62 has three PWM pins and PD7 is not available. OSC1 OSC2 I O Crystal or RC or EC 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. EC is external clock mode, we can connect OSC1 pin with external clock source directly. OSC3 OSC4 I O 32768Hz OSC3 and OSC4 are connected to a 32768Hz crystal oscillator to form a real time clock for timing purposes and for fSUB or fSL. This 32768Hz crystal is dis- abled/enabled by configuration option. VREF I ¾ A/D reference voltage input pin RES I ¾ Schmitt Trigger reset input. Active low VDD ¾¾ Positive power supply VSS ¾¾ Negative power supply, ground AVDD ¾¾ Analog positive power supply AVSS ¾¾ Analog negative power supply, ground HT56R62/HT56R65 HT56R642/HT56R644/HT56R654/HT56R656 Rev. 1.00 5 July 20, 2009 |
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