LC5850

The LC5850 is a kind of CMOS 4-bit microcomputer that operates on low voltage, very small current and contains LCD drivers. The device includes a 4-bit parallel processing ALU, program memory ROM, data memory RAM, many LCD segment outputs, many I/O ports, a prescaler, and a 32.768 kHz crystal oscillator. It is ideal for use in watch/clock, desk-top calculator, camera, speech synthesis LSI controller, equioment controller applications.

There are some features of LC5850 as follows: first is about the hardware features: (1)supply voltage: 1.5 V or 3.0 V typ (mask option); (2)built-in crystal oscillator for watch/clock (32.768 kHz crystal connected externally); (3)possible to use LCD panel drive output pins as ports for output only (mask option); (4)with initial reset pin (port S3 for input only is used by mask option); (5)ROM: 1024*16 bits; (6)RAM: 64*4 bits; (7)cycle time: 244sec (or 122sec/mask option, selectable for EXT-V version only); (8)built-in step-up circuit, step-down circuit; (9)shipping style: QIP (or chip); the second is about the software features: (1)powerful instruction set: 78 instructions; (2)4-level subroutine nesting (common with interrupt); (3)external interrupt function; (4)15-bit divider for watch/clock; (5)built-in 6-bit programmable timer; (6)HALT function; (7)direct addressing type; (8)single stepping of all instructions.

What comes next is about the absolute maximum ratings of LC5850 (Ta=25±2, VDD=0 V): (1)maximum supply voltage, VSS1: -4.0 to +3.0 V at VBAK=VSS1 or VSS2; (2)maximum supply voltage, VSS2: -4.0 to +3.0 V at VSS2=VSS3, VBAK=VSS1 or VSS2; (3)maximum input voltage, VIN1: VBAK-0.3 to 0.3 V when 1OP, OSCIN, TESTI/O; (4)maximum input voltage, VIN2: VSS2-0.3 to 0.3 V when S1-4, M1-4, INT, I/OA1-4, I/OB1-4, TESTA (I/OA1-4, I/OB1-4: input mode); (5)maximum output voltage, VOUT1: VBAK-0.3 to 0.3 V when TESTI/O, CUP2, OSCOUT; (6)maximum output voltage, VOUT2: VSS2-0.3 to 0.3 V when SEGOUT, COM1, CUP1, ALARM, LIGHT, P1-4, I/OA1-4, I/OB1-4, (I/OA1-4, I/OB1-4: input mode); (7)operating temperature, Topg: -20 to +65; (8)storage temperature, Tstg: -30 to +125.