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EM6819 Datasheet(PDF) 80 Page - EM Microelectronic - MARIN SA |
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EM6819 Datasheet(HTML) 80 Page - EM Microelectronic - MARIN SA |
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80 / 154 page  R EM6819 Copyright © 2009, EM Microelectronic-Marin SA 07 /09 – rev.D 80 www.emmicroelectronic.com 16. PORT C The port C is general purpose 8-bit input output port. Each of the 8 Port C terminals can be configured to receive either Analog or digital Input or drive out analog or digital data. 16.1 PORT C TERMINAL MAPPING Several digital and analog functions are mapped on the port C terminals. Please refer also to the concerned chapters. Table 16.1-1 Port C terminal mapping Name IRQ ADC Reset & WkUp VREF VLD OPAMP SPI CLOCK Timer clock Timer start PWM FrqOut high drive PC0 PCIRQ0 ADC1 sig PC1 PCIRQ1 ADC3 VLD OPA_Out t2ck1_in start3_in sig PC2 PAIRQ2 ADC5 OPA_INM SOUT sig PC3 PCIRQ3 ADC7 OPA_INP t4ck1_in start6_in sig HD PC4 PCIRQ4 XOUT ExtCk sig PC5 PCIRQ5 VLD sig HD PC6 PCIRQ6 VLD SCLK t1ck1_in start7_in sig HD PC7 PCIRQ7 t3ck1_in sig 16.2 PORT C IO OPERATION All IO modes are individually selectable for each port C terminal. Refer to table below. Table 16.2-1 Port C IO selections Modes Notes Analog signal connection (in out) 0 X X 0 0 0 High-Z 0 X X 1 X 0 RLoad to VDD Analog signal connection (in out) with weak load to VDD or VSS 0 X X 0 1 0 RLoad to VSS Digital input is blocked, Analog functions can be connected CPU reads ‘0’ Input mode 0 X X 0 0 1 High-Z Digital input, no-pull, needs external driver Input mode with pull-up 0 X X 1 X 1 Weak Hi Digital input with pullup Input mode with pull-down 0 X X 0 1 1 Weak Lo Digital input with pulldown Output, CMOS high level drive 1 1 0 X X X 1 Pull resistors disabled Output, CMOS low level drive 1 0 0 X X X 0 Pull resistors disabled Output, open drain, high-Z 1 1 1 0 X X High-Z Pull-down disabled, Usually ext Resistor pull-up Output, open drain with pull-up 1 1 1 1 X X Weak Hi Pull-up active Output, open drain drive low 1 0 1 X X X 0 Pull-up disabled Note: on all bit of port C debouncers are enable by default after reset, |
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