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MB89P945 Datasheet(PDF) 6 Page - Fujitsu Component Limited. |
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MB89P945 Datasheet(HTML) 6 Page - Fujitsu Component Limited. |
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6 / 38 page  MB89940 Series 6 s PIN DESCRIPTION (Continued) *1: FPT-48P-M16 *2: MQP-48C-P01 Pin no. Pin name Circuit type Function QFP*1 MQFP*2 5 5 X0 A Pin for connecting the crystal resonator. X0 and X1 can be directly connected to a crystal oscillator. When the oscillation clock is provided to X0 externally, X1 should be left open. 66 X1 48 48 MODE B The mode input is used for entering the MPU into the test mode. In user applications, MODE is connected to VSS. 22 RST C Applying a reset pulse to this pin forces the MPU to enter the initial state. RST is active low and drives low state when an internal reset occurs. Reset pulses of the duration less than the minimum pulse width may cause the MCU to enter undefined states. 34 to 27 34 to 27 P00/SEG00 to P07/SEG07 H These pins have two functions. Their functions can be switched between Port 0 and LCD segment signal outputs by setting the internal registers of the LCD controller. 26 to 20, 18 26 to 20, 18 P10/SEG08 to P17/SEG15 J These pins have two functions. Their functions can be switched between Port 1 and LCD segment signal outputs by setting the internal registers of the LCD controller. 17 17 P20/SEG16 I This pin can be used as the bit 0 of Port 2 or an LCD segment signal output by setting the internal register of the LCD controller. 16 16 P21/V0 F This pin is the bit 1 of Port 2. This pin can also be used for an external LCD bias voltage input. 15 15 P22/EC/V1 F This pin can be used as the bit 2 of Port 2 or the external clock input for the interval timer. This pin can also be used for an external LCD bias voltage input. 14 14 P23/TO/V2 F This pin can be used as the bit 3 of Port 2 or the output for the interval timer. Its function can be switched by setting the internal register of the interval timer. This pin can also be used for an external LCD bias voltage input. 13 13 P24/V3 F This pin can be used as the bit 4 of Port 2 or an external LCD bias voltage input. 12, 11, 10 12, 11, 10 P25/INT0 to P27/INT2 E These pins are used for Port 2. They can also be used for external interrupt inputs. 35 35 P30/FUELO D This pin can be used for the bit 0 of Port 3 or the output from PWM3. The function of this pin can be switched by setting the internal register of PWM3. |
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