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HT56R668 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT56R668 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 104 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/TMR2 PA5/TMR3 PA6~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, PA3, PA4 and PA5 are shared with BZ, BZ, PFD, TMR2 and TMR3 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. PB0/AN0~ PB7/AN7 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. 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. 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 input clock source directly to OSC1 pin. OSC3 OSC4 I O 32768Hz OSC3 and OSC4 are connected to a 32768Hz crystal oscillator to form a real time clock for fSUB. This 32768Hz crystal is disabled/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 HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688 Rev. 1.20 5 March 4, 2010 |
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