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6 / 132 page ST7263B 6/132 PIN DESCRIPTION (Cont’d) RESET (see Note 1): Bidirectional. This active low signal forces the initialization of the MCU. This event is the top priority non maskable interrupt. This pin is switched low when the Watchdog is trig- gered or the VDD is low. It can be used to reset ex- ternal peripherals. OSCIN/OSCOUT: Input/Output Oscillator pin. These pins connect a parallel-resonant crystal, or an external source, to the on-chip oscillator. VDD/VSS (see Note 2): Main Power Supply and Ground voltages. VDDA/VSSA (see Note 2): Power Supply and Ground voltages for analog peripherals. Alternate Functions: Several pins of the I/O ports assume software programmable alternate func- tions as shown in the pin description. Note 1: Adding two 100 nF decoupling capacitors on the Reset pin (respectively connected to VDD and V SS) will significantly improve product electro- magnetic susceptibility performance. Note 2: To enhance the reliability of operation, it is recommended that VDDA and VDD be connected to- gether on the application board. This also applies to VSSA and VSS. Table 2. Device Pin Description Pin n° Pin Name Level Port / Control Main Function (after reset) Alternate Function Input Output 11 VDD S Power supply voltage (4V - 5.5V) 2 2 OSCOUT O Oscillator output 3 3 OSCIN I Oscillator input 44 VSS S Digital ground 5 5 PC2/USBOE I/O CT X X Port C2 USB Output Enable 6 6 PC1/TDO I/O CT X X Port C1 SCI Transmit Data Output* 7 7 PC0/RDI I/O CT X X Port C0 SCI Receive Data Input* 8 8 RESET I/O X X Reset -- 9 NC -- Not connected 9 10 PB7/AIN7/IT8 I/O CT 10mA X XX X Port B7 ADC analog input 7 10 11 PB6/AIN6/IT7 I/O CT 10mA X XX X Port B6 ADC analog input 6 11 12 VPP/TEST S Programming supply 12 13 PB5/AIN5/IT6 I/O CT 10mA X XX X Port B5 ADC analog input 5 13 14 PB4/AIN4/IT5 I/O CT 10mA X XX X Port B4 ADC analog input 4 14 15 PB3/AIN3 I/O CT 10mA X XX Port B3 ADC analog input 3 15 16 PB2/AIN2 I/O CT 10mA X XX Port B2 ADC analog input 2 16 17 PB1/AIN1 I/O CT 10mA X XX Port B1 ADC analog input 1 17 18 PB0/AIN0 I/O CT 10mA X XX Port B0 ADC Analog Input 0 18 19 PA7/OCMP2/IT4 I/O CT X XX Port A7 Timer Output Compare 2 19 20 PA6/OCMP1/IT3 I/O CT X XX Port A6 Timer Output Compare 1 20 21 PA5/ICAP2/IT2 I/O CT X XX Port A5 Timer Input Capture 2 21 22 PA4/ICAP1/IT1 I/O CT X XX Port A4 Timer Input Capture 1 |
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