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MSC1200 Datasheet(PDF) 43 Page - Texas Instruments |
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MSC1200 Datasheet(HTML) 43 Page - Texas Instruments |
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43 / 60 page ![]() MSC1200 43 SBAS289E www.ti.com 7 6 5 4 3 2 1 0 Reset Value SFR B3H P33H P33L P32H P32L P31H P31L P30H P30L 00H P33H P33L 0 0 Standard 8051 0 1 CMOS Output 1 0 Open Drain Output 1 1 Input P32H P32L 0 0 Standard 8051 0 1 CMOS Output 1 0 Open Drain Output 1 1 Input P31H P31L 0 0 Standard 8051 0 1 CMOS Output 1 0 Open Drain Output 1 1 Input P30H P30L 0 0 Standard 8051 0 1 CMOS Output 1 0 Open Drain Output 1 1 Input 7 6 5 4 3 2 1 0 Reset Value SFR B0H P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0 FFH SCK/SCL/CLKS T1 T0 INT1 INT0 TXD0 RXD0 Port 3 (P3) P3.7-0 General-Purpose I/O Port 3. This register functions as a general-purpose I/O port. In addition, all the pins have bits 7-0 an alternative function listed below. Each of the functions is controlled by several other SFRs. The associated Port 3 latch bit must contain a logic ‘1’ before the pin can be used in its alternate function capacity. SCK/SCL/CLKS Clock Source Select. Refer to PASEL (SFR F2H). bit 6 T1 Timer/Counter 1 External Input. A 1 to 0 transition on this pin will increment Timer 1. bit 5 T0 Timer/Counter 0 External Input. A 1 to 0 transition on this pin will increment Timer 0. bit 4 INT1 External Interrupt 1. A falling edge/low level on this pin will cause an external interrupt 1 if enabled. bit 3 INT0 External Interrupt 0. A falling edge/low level on this pin will cause an external interrupt 0 if enabled. bit 2 TXD0 Serial Port 0 Transmit. This pin transmits the serial Port 0 data in serial port modes 1, 2, 3, and emits the bit 1 synchronizing clock in serial port mode 0. RXD0 Serial Port 0 Receive. This pin receives the serial Port 0 data in serial port modes 1, 2, 3, and is a bidirectional bit 0 data transfer pin in serial port mode 0. Port 3 Data Direction Low Register (P3DDRL) P3.3 Port 3 bit 3 control. bits 7-6 P3.2 Port 3 bit 2 control. bits 5-4 P3.1 Port 3 bit 1 control. bits 3-2 P3.0 Port 3 bit 0 control. bits 1-0 |
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