KS51850

2 KS51850 51850 OVERVIEW KS51850, a 4-bit single-chip CMOS microcontroller, consists of the reliable SMCS-51 CPU core with on-chip ROM and RAM. Eight input pins and 11 output pins provide the flexibility for various I/O requirements. Auto reset circuit generates reset pulse every certain period, and every halt mode termination time. The KS51850 microcontroller has been designed for use in small system control applications that require a low-power, cost sensitive design solution. In addition, the KS51850 has been optimized for remote control transmitter and has built-in Transistor for I.R.LED drive. FEATURES ROM Size 1,024 bytes RAM Size 32 nibbles Instruction Set 39 instructions Instruction Cycle Time 13.2 µsec at fxx = 455 kHz Input Ports Two 4-bit ports (24 pins)/one 4-bit, Five1-bit ports (20 pins) Four Transmission Frequencies fxx/12 (1/4 duty), fxx/12 (1/3 duty), fxx/8 (1/2 duty), and no-carrier frequency Built-in Transistor for I.R.LED Drive IOL1: 210 ma (typical) at VDD = 3V and VO = 0.4V Supply Voltage 1.8 V-3.6 V (250 kHz ≤ fOSC ≤ 3.9 MHz) 2.2 V-3.6 V (3.9 MHz < fOSC ≤ 6 MHz) Power Consumption Halt mode: 1 µA (maxium) Normal mode: 0.5 mA (typical) Output Ports One 4-bit, Seven 1-bit ports (24pins)/One 4-bit, Five 1-bit ports (20 pins) Built-in Oscillator Crystal/Ceramic resonator Built-in Reset Circuit Power-on reset and auto reset circuit for generating reset pulse every 13.1072/fxx (288 ms at fxx = 455 kHz) Operating temperature -...