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EM78P447NAM Datasheet(PDF) 17 Page - ELAN Microelectronics Corp |
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EM78P447NAM Datasheet(HTML) 17 Page - ELAN Microelectronics Corp |
17 / 57 page ![]() EM78P447N OTP ROM 4.4 I/O Ports The I/O registers, Port 5, Port 6, and Port 7, are bi-directional tri-state I/O ports. The functions of Pull-high, R-option, and Open-drain can be performed internally by CONT and IOCE respectively. There is input status change wake-up function on Port 6, P74, and P75. Each I/O pin can be defined as "input" or "output" pin by the I/O control register (IOC5 ~ IOC7). The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 5, Port 6, and Port 7 are shown in Figures. 7(a) and (b) respectively. PDRD Q Q CLK D PCWR PDWR Q Q CLK D PR CL PORT 0 1 M U X IOD PCRD PR CL Fig. 7 (a) The I/O Port and I/O Control Register Circuit PDRD Q Q CLK D PCWR PDWR Q Q CLK D 0 1 M U X IOD ROC VCC Weakly Pull- up PORT Rex* *The Rex is 430K ohm external resistor PCRD PR CL PR CL This specification is subject to change without prior notice. 10.21.2004 (V1.0) 17 Fig.7(b) The I/O Port with R-Option (P70, P71) Circuit |
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