LC72321

Ordering number : EN4796A CMOS LSI LC72321 Single-Chip Microcontroller with PLL and LCD Driver Preliminaly Overview The LC72321 is a single-chip microcontroller for use in electronic tuning applications. It includes on chip both LCD drivers and a PLL circuit that can operate at up to 150 MHz. It features a large-capacity ROM, a highly efficient instruction set, and powerful hardware. Voltage detection type reset circuit One 6-bit A/D converter Two 8-bit D/A converters (PWM) One external interrupt (The LC72321 provides an external interrupt, and internal interrupt and a serial I/O interrupt, one of which can be selected under program control.) Hold mode for RAM backup Sense FF for hot/cold startup determination PLL: 4.5 to 5.5 V CPU: 3.5 to 5.5 V RAM: 1.3 to 5.5 V Functions Serial I/O Built-in timer interrupts: 80 µs, 1 ms, 2 ms and 5 ms Stack: Eight levels Beep control: Six beep tones (2.08, 2.25, 2.5, 3.0, 3.75, and 4.17 kHz) Fast programmable divider General-purpose counters: HCTR for frequency measurement and LCTR for frequency or period measurement LCD driver for displays with up to 56 segments (1/2 duty, 1/2 bias) Program memory (ROM): 16 bits × 4095 Data memory (RAM): 4 bits × 256 All instructions are single-word instructions Cycle time: 2.67 µs, 13.33 µs, or 40.00 µs (option) Unlock FF: 0.55 µs detection, 1.1 µs detection Timer FF: 1 ms, 5ms, 25ms, 125ms Input ports*: One dedicated key input port and one high breakdown voltage port Outp...