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ST6228CN3 Datasheet(PDF) 6 Page - STMicroelectronics |
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ST6228CN3 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 84 page 6/84 ST62T28C/E28C 1.2 PIN DESCRIPTIONS VDD and VSS. Power is supplied to the MCU via these two pins. VDD is the power connection and VSS is the ground connection. OSCin and OSCout. These pins are internally connected to the on-chip oscillator circuit. A quartz crystal, a ceramic resonator or an external clock signal can be connected between these two pins. The OSCin pin is the input pin, the OSCout pin is the output pin. RESET. The active-low RESET pin is used to re- start the microcontroller. TEST/V PP. The TEST must be held at VSS for nor- mal operation. If TEST pin is connected to a +12.5V level during the reset phase, the EPROM/ OTP programming Mode is entered. NMI. The NMI pin provides the capability for asyn- chronous interruption, by applying an external non maskable interrupt to the MCU. The NMI input is falling edge sensitive with Schmitt trigger charac- teristics. The user can select as option the availa- bility of an on-chip pull-up at this pin. PA0-PA5. These 6 lines are organised as one I/O port (A). Each line may be configured under soft- ware control as inputs with or without internal pull- up resistors, input with interrupt generation and pull-up resistor, open-drain or push-pull outputs. PA2/ARTIMout and PA3/ARTIMin can be used re- spectively as output and input pins for the embed- ded 8-bit Auto-Reload Timer. In addition, PA0-PA5 can sink 20mA for direct LED or TRIAC drive. PB4...PB6. These 3 lines are organised as one I/O port (B). Each line may be configured under soft- ware control as inputs with or without internal pull- up resistors, input with interrupt generation and pull-up resistor, open-drain or push-pull outputs, analog inputs for the A/D converter. PC4-PC7. These 4 lines are organised as one I/O port (C). Each line may be configured under soft- ware control as input with or without internal pull- up resistor, input with interrupt generation and pull-up resistor, open-drain or push-pull output. PC4 and PC5 can also be used as analog input for the A/D converter, while PC6 and PC7 can sink 20mA for direct LED or TRIAC drive. PD1...PD7. These 7 lines are organised as one I/O port (portD). Each line may be configured under software control as input with or without internal pull-up resistor, input with interrupt generation and pull-up resistor, analog input open-drain or push- pull output. In addition, the pins PD5/TXD1 and PD4/RXD1 can be used as UART output (PD5/ TXD1) or UART input (PD4/RXD1). The pins PD3/ Sout, PD2/Sin and PD3/Scl can also be used re- spectively as data out, data in and clock pins for the on-chip SPI. TIMER. This is the TIMER 1 I/O pin. In input mode, it is connected to the prescaler and acts as ex- ternal timer clock or as control gate for the internal timer clock. In output mode, the TIMER pin outputs the data bit when a time-out occurs.The user can select as option the availability of an on-chip pull- up at this pin. Figure 2. ST62T28C/E28C Pin Configuration 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VDD TIMER OSCin OSCout NMI TEST/VPP (1) RESET PC7* PC6* Ain/PC5 VSS PA0* PA1* PA2*/ARTIMout PA3*/ARTIMin PD3/Ain/Sout PD4/Ain/RXD1 PD5/Ain/TXD1 PD6/Ain PD7/Ain 28 27 26 25 24 23 22 21 Ain/PC4 Ain/PB6 Ain/PB5 Ain/PB4 PA4* PA5* PD1/Ain/Scl PD2/Ain/Sin (1) V PP on EPROM/OTP only VR01804B (*) 20 mA Sink 6 |
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