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N78E517A Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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N78E517A Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 141 page  N78E517A Data Sheet - 4 - 1. DESCRIPTION N78E517A is an 8-bit microcontroller, which has an in-system programmable Flash supported. The instruction set of N78E517A is fully compatible with the standard 8051. N78E517A contains a maximum 64k [1] bytes of main Flash APROM, in which the contents of the main program code can be updated by parallel Program- mer/Writer or In System Programming (ISP) method which enables on-chip firmware updating. There is an ad- ditional 2.5k bytes called LDROM for ISP function. N78E517A has a configurable size of Data Flash [1] which is 64k-byte shared with APROM, accessed with ISP. N78E517A provides 256 bytes of SRAM, 1k bytes of auxilia- ry RAM (XRAM), four 8-bit bi-directional and bit-addressable I/O ports, an additional 8-bit bi-directional and bit- addressable port P4 for LQPF-48 package (PLCC-44, PQFP-44, and TQFP-44 just have low nibble 4 bits of P4 and DIP-40 does not have this additional P4), three 16-bit Timers/Counters, one UART, five PWM output channels, and one SPI. These peripherals equip with 11-source with 4-level priority interrupts capability. To facilitate programming and verification, the Flash inside the N78E517A allows the Program Memory to be pro- grammed and read electronically. Once the code confirms, the user can lock the code for security. N78E517A is built in a precise on-chip RC oscillator of 22.1184MHz/11.0592MHz selected by CONFIG setting, factory trimmed to ±1% at room temperature. N78E517A provides additional power monitoring detection such as power-on and Brown-out detection. It stabilizes the power-on/off sequence for a high reliability system de- sign. N78E517A microcontroller operation consumes a very low power. Two economic power modes to reduce pow- er consumption, Idle mode and Power Down mode. Both of them are software selectable. The Idle mode turns off the CPU clock but allows continuing peripheral operation. The Power Down mode stops the whole system clock for minimum power consumption. [1] Data Flash and APROM share 64k-byte space. |
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