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80C166 Datasheet(PDF) 7 Page - Siemens Semiconductor Group |
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80C166 Datasheet(HTML) 7 Page - Siemens Semiconductor Group |
7 / 52 page SAB 80C166/83C166 Semiconductor Group 6 P3.0 – P3.15 80-92, 95-97 80 81 82 83 84 85 86 87 88 89 90 91 92 95 96 97 I/O I/O I O I O I I I I O I/O O I/O O O I O Port 3 is a 16-bit bidirectional I/O port. It is bit-wise programmable for input or output via direction bits. For a pin configured as input, the output driver is put into high-impedance state. The following Port 3 pins also serve for alternate functions: P3.0 T0IN CAPCOM Timer T0 Count Input P3.1 T6OUT GPT2 Timer T6 Toggle Latch Output P3.2 CAPIN GPT2 Register CAPREL Capture Input P3.3 T3OUT GPT1 Timer T3 Toggle Latch Output P3.4 T3EUD GPT1 Timer T3 Ext.Up/Down Ctrl.Input P3.5 T4IN GPT1 Timer T4 Input for Count/Gate/Reload/Capture P3.6 T3IN GPT1 Timer T3 Count/Gate Input P3.7 T2IN GPT1 Timer T2 Input for Count/Gate/Reload/Capture P3.8 TxD1 ASC1 Clock/Data Output (Asyn./Syn.) P3.9 RxD1 ASC1 Data Input (Asyn.) or I/O (Syn.) P3.10 T ×D0 ASC0 Clock/Data Output (Asyn./Syn.) P3.11 R ×D0 ASC0 Data Input (Asyn.) or I/O (Syn.) P3.12 BHE Ext. Memory High Byte Enable Signal P3.13 WR External Memory Write Strobe P3.14 READY Ready Signal Input P3.15 CLKOUT System Clock Output (=CPU Clock) P0.0 – P0.15 98 – 5 8 – 15 I/O Port 0 is a 16-bit bidirectional IO port. It is bit-wise programmable for input or output via direction bits. For a pin configured as input, the output driver is put into high-impedance state. In case of an external bus configuration, Port 0 serves as the address (A) and address/data (AD) bus in multiplexed bus modes and as the data (D) bus in demultiplexed bus modes. Demultiplexed bus modes: Data Path Width: 8-bit 16-bit P0.0 – P0.7: D0 – D7 D0 - D7 P0.8 – P0.15: output! D8 - D15 Multiplexed bus modes: Data Path Width: 8-bit 16-bit P0.0 – P0.7: AD0 – AD7 AD0 - AD7 P0.8 – P0.15: A8 - A15 AD8 - AD15 V AREF 54 - Reference voltage for the A/D converter. V AGND 55 - Reference ground for the A/D converter. Pin Definitions and Functions (cont’d) Symbol Pin Number Input Output Function |
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