The EM78P447S from ELAN is an 8-bit microprocessor built with low-power, high-speed CMOS technology. It includes 4K×13-bit electrically one-time programmable ROM, a protection bit, seven option bits, 148×8-bit on-chip registers, and three bidirectional I/O ports. The document explains that the OTP-ROM feature supports developing and verifying user programs and notes that EMC Writer can be used for programming.
This datasheet presents features, pin assignments and pin descriptions for the 28-pin DIP/SOP/SSOP and 32-pin DIP/SOP versions. It also describes operational registers, program counter and stack organization, status and RAM select registers, and AC electrical characteristics, with supporting tables and timing values.
| Operating voltage | 2.3 V to 5.5 V |
|---|---|
| Operating temperature | 0°C to 70°C |
| On-chip OTP ROM | 4K × 13 bits |
| On-chip registers (SRAM) | 148 × 8 bits |
| I/O ports | 3 bidirectional I/O ports |
| Crystal-mode operating frequency | DC~20 MHz at 5 V; DC~8 MHz at 3 V; DC~4 MHz at 2.3 V |
| Instruction cycle | Two clocks per instruction cycle |
| Program memory page size | 1024 words |
It operates from 2.3 V to 5.5 V.
It has 4K × 13 bits of on-chip OTP ROM and 148 × 8 bits of on-chip registers.
It prevents intrusion of OTP memory codes.
The document states that the user can use EMC Writer to program development code.