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ST10F167 Scheda tecnica(PDF) 10 Page - STMicroelectronics |
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ST10F167 Scheda tecnica(HTML) 10 Page - STMicroelectronics |
10 / 69 page 10/69 ST10F167 PORT1: P1L.0 – P1L.7, P1H.0 - P1H.7 118 – 125 128 – 135 132 133 134 135 I/O I I I I PORT1 consists of the two 8-bit bidirectional I/O ports P1L and P1H. 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. PORT1 is used as the 16-bit address bus (A) in demultiplexed bus modes and also after switching from a demul- tiplexed bus mode to a multiplexed bus mode. The following PORT1 pins also serve for alternate functions: P1H.4 CC24IO CAPCOM2: CC24 Capture Input P1H.5 CC25IO CAPCOM2: CC25 Capture Input P1H.6 CC26IO CAPCOM2: CC26 Capture Input P1H.7 CC27IO CAPCOM2: CC27 Capture Input XTAL1 XTAL2 138 137 I O XTAL1: Input to the oscillator amplifier and input to the internal clock generator XTAL2: Output of the oscillator amplifier circuit. To clock the device from an external source, drive XTAL1, while leaving XTAL2 unconnected. Minimum and maximum high/low and rise/fall times specified in the AC Characteristics must be ob- served. RSTIN 140 I Reset Input with Schmitt-Trigger characteristics. A low level at this pin for a specified duration while the oscillator is running resets the ST10F167. An internal pullup resistor permits power-on reset us- ing only a capacitor connected to V SS. RSTOUT 141 O Internal Reset Indication Output. This pin is set to a low level when the part is executing, either a hardware, a software or a watchdog timer reset. RSTOUT remains low until the EINIT (end of initializa- tion) instruction is executed. NMI 142 I Non-Maskable Interrupt Input. A high to low transition at this pin causes the CPU to vector to the NMI trap routine. When the PWRDN (power down) instruction is executed, the NMI pin must be low in order to force the ST10F167 to go into power down mode. If NMI is high, when PWRDN is executed, the part will con- tinue to run in normal mode. If not used, pin NMI should be pulled high externally. V AREF 37 - Reference voltage for the A/D converter. V AGND 38 - Reference ground for the A/D converter. V PP 84 - Flash programming voltage. This pin accepts the programming voltage for the on-chip flash EPROM of the ST10F167. Table 2.1 Pin Definitions and Functions (cont’d) Symbol Pin Number Input (I) Output (O) Function 3 |
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