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EM78P451SWM Datasheet(PDF) 7 Page - ELAN Microelectronics Corp |
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EM78P451SWM Datasheet(HTML) 7 Page - ELAN Microelectronics Corp |
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7 / 54 page  EM78P451S 8-Bit Microcontroller with OTP ROM Product Specification (V1.0) 06.01.2004 • 3 (This specification is subject to change without further notice) Table 1 Pin description Symbol Pin No. Type Function Description R-OSCI 39 I In XTAL mode: Crystal input; In internal C, external R mode: 56Kohm ±5% pull high for 1.8432MHz. OSCO 40 O In XTAL mode: Crystal output; In RC mode: Instruction clock output. P90~P95 5~10 I/O General bi-directional I/O port. All of its pins can be pulled-high by software. P90 and P91 are pin-change wake up pins. P80~P87 19~26 I/O General bi-directional I/O port. All of its pins can be pulled-high by software. P80 and P81 are also used as the R-option pins. P70~P72 37~35 I/O LED direct-driving pin with internal serial resistor used as output and is software defined. P70/ RESET 37 I/O LED direct-driving pin with internal serial resistor used as output and is software defined. Code option bit 3 (REN): reset enable REN=0 => for reset pin REN=1 => for general purpose I/O (P70) Internal pull high resistor 220Kohm CLK 4 I/O By connecting P74 and P76 together. P74 can be pulled-high by software and it is also a pin-change wake up pin. P76 can be defined as an open-drain output. DATA 3 I/O By connecting P75 and P77 together. P75 can be pulled-high by software and it is also a pin-change wake up pin. P77 can be defined as an open-drain output. P60~P67 27~34 I/O General bi-directional port. All of its pins can be pulled-high by software, and pin-change wake up pins. P50~P57 11~18 I/O General bi-directional I/O port. All of its pins can be pulled-high individually by software. VDD 38 - Power supply pin. VSS 1 - Ground pin. /INT 2 I An interrupt schmitt-triggered pin. The function of interrupt triggers at the falling edge. Users can enable it by software. SDI 7 I/O Serial data in for SPI SDO 8 I/O Serial data out for SPI. SCK 9 I/O Serial clock for SPI. /SS 10 I/O /Slave select for SPI. |
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