器件名称:
SM3518
功能描述:
4-Bit Single-Chip Microcomputer(For Data Bank Use)
文件大小:
34.21KB 共3页
简 介:
SM3518 SM3518 DESCRIPTION The SM3518 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memory RAM, LCD driver (the output is adjustable in 16 steps for various contrast), key/switch input circuit, 8-bit parallel I/O port, 2 output ports and buzzer output circuit. The chip also has memory expansion controlling feature. One of two ports contains special output circuit for infrared (IR) communication. By connecting an external crystal, a 1 Hz timer is made possible for easier clock function. 4-Bit Single-Chip Microcomputer (For Data Bank Use) FEATURES ROM capacity : Program ROM 12 k x 23 bits Character ROM 6 x 8 x 256 bits Constant ROM 1 k x 4 bits RAM capacity : Working RAM 256 x 4 bits Display RAM 74 x 16 bits Data RAM 3 k x 8 bits Memory expansion (external) : 1M x 8 bits x 3 LCD display : 74 - segment x 16 - common I/O ports : Parallel I/O 8 bits Input 2 bits Output 2 bits Buzzer output 1 bit (4 kHz) Key input 6 bits Standby release : 2 events (2 Hz signal, key input) Built-in oscillator : System clock (built-in CR oscillator) 1 MHz (external ceramic resonator) 1 MHz Timer (built-in CR oscillator) 32.8 kHz (external crystal) 32.768 kHz Instruction cycle time : 3 s Operating temperature : –10 to +60°C Supply voltage : 2.5 to 5.5 V Package : 128-pin QFP (QFP128-P-2828) [Test Sample only] In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP ……
