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HT46RU66 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT46RU66 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 63 page  Pin Description Pin Name I/O Configuration Option Description PA0/BZ PA1/BZ PA2 PA3/PFD PA4~PA7 I/O Pull-high Wake-up Buzzer PFD Bidirectional 8-bit input/output port. Each individual pin on this port can be configured as a wake-up input by a configuration option. Software in- structions determine if the pin is a CMOS output or Schmitt Trigger input. Configuration options determine which pins on the port have pull-high resistors. Pins PA0, PA1 and PA3 are pin-shared with BZ, BZ and PFD respectively, the function of which is chosen via configuration options. PB0/AN0~ PB7/AN7 I/O Pull-high Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt Trigger input. Configuration options determine which pins on the port have pull-high resistors. PB is pin-shared with the A/D input pins. The A/D inputs are selected via soft- ware instructions. Once selected as an A/D input, the I/O function and pull-high resistor functions are disabled automatically. PC0/TMR2 PC1~PC5 PC6/TX PC7/RX 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 the port has pull-high resistors. Pin PC0 is pin-shared with the timer input pin TMR2. Pins PC6 and PC7 are pin-shared with the UART pins TX and RX. PD0/PWM0 PD1/PWM1 PD2/PWM2 PD3/PWM3 PD4/INT0 PD5/INT1 PD6/TMR0 PD7/TMR1 I/O Pull-high PWM Interrupt Bidirectional 8-bit input/output port. Software instructions determine if the pin is a CMOS output or Schmitt Trigger input. Configuration options determine which pins on the port have pull-high resistors. PD0~PD3 are pin-shared with PWM0~PWM3, the function of each pin is selected via a configuration option. Pins PD4 and PD5 are pin-shared with external in- terrupt input pins INT0 and INT1 respectively. Configuration options de- termine the interrupt enable/disable and the interrupt low/high trigger type. Pins PD6 and PD7 are pin-shared with the external timer input pins TMR0 and TMR1 respectively. OSC1 OSC2 I O Crystal or RC OSC1 and OSC2 are connected to an external RC network or external crystal, determined by configuration option, for the internal system clock. For external RC system clock operation, OSC2 is an output pin where the system frequency can be monitored, at a frequency of 1/4 system clock. If an RTC oscillator on pins OSC3 and OSC4 is used as a system clock, then the OSC1 and OSC2 pins should be left floating. OSC3 OSC4 I O RTC or System Clock OSC3 and OSC4 are connected to a 32768Hz crystal to form a real time clock for timing purposes or to form a system clock. VLCD ¾ ¾ LCD power supply VMAX ¾ ¾ IC maximum voltage, connect to VDD,VLCD or V1 V1, V2, C1, C2 I ¾ LCD voltage pump SEG0~SEG7 O SEG0~SEG7 or CMOS output LCD driver outputs for LCD panel segments. A configuration option can select all pins to be used as segment drivers or all pins to be used as CMOS outputs. SEG8~SEG15 O SEG8~SEG15 or CMOS output LCD driver outputs for LCD panel segments. A configuration option can select all pins to be used as segment drivers or all pins to be used as CMOS outputs. SEG16~SEG23 O SEG16~SEG23 CMOS output LCD driver outputs for LCD panel segments. Configuration options can select each pin to be used as either a segment driver or each pin to be used as a CMOS output. SEG24~SEG45 O ¾ LCD driver outputs for LCD panel segments COM0~COM2 COM3/SEG46 O 1/3 or 1/4 Duty COM3 or SEG46 An LCD duty-cycle configuration option determines if SEG46 is config- ured as a segment driver or as a common output driver for the LCD panel. COM0~COM2 are the LCD common outputs. HT46RU66/HT46CU66 Rev. 1.20 4 October 2, 2007 |
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