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EM78P447S Datasheet(PDF) 7 Page - ELAN Microelectronics Corp |
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EM78P447S Datasheet(HTML) 7 Page - ELAN Microelectronics Corp |
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7 / 55 page  EM78P447S OTP ROM Table 2 EM78P447SAS Pin Description Symbol Pin No. Type Function VDD 3 - * Power supply. OSCI 27 I * XTAL type: Crystal input terminal or external clock input pin. * RC type: RC oscillator input pin. OSCO 26 I/O * XTAL type: Output terminal for crystal oscillator or external clock input pin. * RC type: Instruction clock output. * External clock signal input. TCC 2 I * The real time clock/counter (with Schmitt trigger input pin) must be tied to VDD or VSS if not in use. /RESET 28 I * Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain in reset condition. P50~P53 5~8 I/O * P50~P53 are bi-directional I/O pins. P60~P67 9~13, 15~17 I/O * P60~P67 are bi-directional I/O pins. These can be pulled -high internally by software control. P70~P77 18~25 I/O * P70~P77 are bi-directional I/O pins. * P74~P75 can be pulled -high internally by software control. * P76~P77 can have open-drain output by software control. * P70 and P71 can also be defined as the R-option pins. /INT 4 I * External interrupt pin triggered by falling edge. VSS 1,14 - * Ground. Table 3 EM78P447SBP and EM78P447SBWM Pin Description Symbol Pin No. Type Function VDD 4 - * Power supply. OSCI 29 I * XTAL type: Crystal input terminal or external clock input pin. * RC type: RC oscillator input pin. OSCO 28 I/O * XTAL type: Output terminal for crystal oscillator or external clock input pin. * RC type: Instruction clock output. * External clock signal input. TCC 3 I * The real time clock/counter (with Schmitt trigger input pin), must be tied to VDD or VSS if not in use. /RESET 30 I * Input pin with Schmitt trigger. If this pin remains at logic low, the controller will keep in reset condition. P50~P57 8~11,2~1, 32~31 I/O * P50~P57 are bi-directional I/O pins. P60~P67 12~19 I/O * P60~P67 are bi-directional I/O pins. These can be pulled -high internally by software control. P70~P77 20~27 I/O * P70~P77 are bi-directional I/O pins. * P74~P75 can be pulled-high internally by software control. * P76~P77 can have open-drain output by software control. * P70 and P71 can also be defined as the R-option pins. /INT 7 I * External interrupt pin triggered by falling edge. VSS 6 - * Ground. NC 5 - * No connection. This specification is subject to change without prior notice. 06.25.2003 (V1.1) 7 |
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