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EM78P157NAKM Datasheet(PDF) 10 Page - ELAN Microelectronics Corp |
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EM78P157NAKM Datasheet(HTML) 10 Page - ELAN Microelectronics Corp |
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10 / 56 page  EM78P157N 8-Bit Microcontroller with OTP ROM 4 • Product Specification (V1.0) 09.22.2005 (This specification is subject to change without further notice) 3.2.3 EM78P157NAAS Pin Descriptions Symbol Pin No. Type Function VDD 15 – Power supply OSCI 17 I XTAL type: Crystal input terminal or external clock input pin ERC type: RC oscillator input pin OSCO 16 I/O XTAL type: Output terminal for crystal oscillator or external clock input pin RC type: Instruction clock output External clock signal input TCC 4 I The real time clock/counter (with Schmitt trigger input pin), must be tied to VDD or VSS if not in use /RESET 5 I Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain at reset condition. P50~P53 18, 19, 2, 3 I/O P50~P53 are bi-directional I/O pins P50 and P51 can also be defined as the R-option pins P50~P52 can be set as pull-down by software P60~P67 7~14 I/O P60~P67 are bi-directional I/O pins These pins can be set as pull-high or open-drain through software programming P60~P63 can also be set as pull-down by software /INT 7 I External interrupt pin triggered by falling edge VSS 6 – Ground 3.2.4 EM78P157NAKM Pin Descriptions Symbol Pin No. Type Function VDD 15,16 – Power supply OSCI 18 I XTAL type: Crystal input terminal or external clock input pin ERC type: RC oscillator input pin OSCO 17 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 4 I Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain at reset condition. P50~P53 19, 20, 1, 2 I/O P50~P53 are bi-directional I/O pins P50 and P51 can also be defined as the R-option pins P50~P52 can be set as pull-down by software P60~P67 7~14 I/O P60~P67 are bi-directional I/O pins These pins can be set as pull-high or open-drain through software programming P60~P63 can also be set as pull-down by software /INT 7 I External interrupt pin triggered by falling edge VSS 5, 6 – Ground |
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