M34551E8FP 4-bit Single-Chip CMOS Microcomputer QFP-48 SMD IC

Description

M34551E8FP 4-bit Single-Chip CMOS Microcomputer QFP-48 SMD IC The M34551E8FP is a 4-bit single-chip CMOS microcomputer from the 4551 family, supplied in a 48-pin QFP package and intended primarily for infrared remote-control transmitter designs and related embedded control tasks. The device integrates program ROM, working RAM, multiple timers (including watchdog capability), an LCD drive/control subsystem, carrier-wave generation and a range of I/O ports — providing a compact solution where a dedicated small microcontroller with LCD and IR capability is required. Features One-time PROM program memory (8192 words × 10 bits) and 280 words × 4-bit RAM. 4-bit CPU core compatible with the 4500 series instruction set. Ttypical minimum instruction execution time 3.0µs. On-chip clock generator supporting ceramic resonator or quartz crystal and selectable system clock division. Multiple timers: 8-bit timer with reload register, 14-bit timer usable as watchdog, and a 4-bit timer with reload register. Integrated LCD drive/control (segment & common outputs) for direct connection to small segmented LCD displays. Carrier-wave output and carrier frequency switching for infrared transmitter modulation. On-chip interrupt sources, voltage-drop detection and peripheral I/O ports (multiple 4-bit I/O ports and port D). PINOUT Pin Name Input / Output Function V DD Power supply — Connected to a plus power supply. V SS Ground — Connected to a 0 V power supply. CNV SS CNV SS Input Connect CNV SS to V SS and apply “L” (0 V) to CNV SS when required. RESET Reset input I/O N-channel open-drain I/O for system reset; internal pull-up; outputs “L” on watchdog reset or low supply detection. XIN Main clock input Input Main clock input for the on-chip clock generator; connect crystal/resonator between XIN and XOUT. XOUT Main clock output Output Main clock output; internal feedback resistor between XIN and XOUT. D0–D4 Port D outputs Output Each pin is a 1-bit independent output (N-channel open-drain). D5 / INT Port D / INT I/O 1-bit output; D5 also functions as INT input. When used as INT input set output latch = “1”. Output structure is N-channel open-drain. D6 / XCIN Port D / Sub-clock input I/O D6 may be used as XCIN for the sub-clock generator; otherwise normal port D function (N-channel open-drain). D7 / XCOUT Port D / Sub-clock output Output D7 may be used as XCOUT for the sub-clock (32.0 kHz) crystal; internal feedback resistor present. P0 0 –P0 3 I/O port P0 I/O 4-bit I/O port, N-channel open-drain. Can act as input when output latch = “1”. Pull-up and key-on wakeup functions available. P1 0 –P1 3 I/O port P1 I/O 4-bit I/O port, N-channel open-drain. Programmable pull-ups and wakeup functions. P2 0 /SEG16–P2 3 /SEG19 Input port P2 / Segment outputs I/O 4-bit input port; P20–P23 can also serve as LCD segment outputs SEG16–SEG19. CARR Carrier wave output Output Carrier-wave output for IR remote transmit; CMOS output structure. SEG0–SEG15 Segment outputs Output LCD segment output pins. COM0–COM3 Common outputs Output LCD common outputs. COM0–COM1 used for 1/2 duty; COM0–COM2 for 1/3 duty; COM0–COM3 for 1/4 duty. Specifications Parameter Value Device M34551E8FP (4551 Group) Program ROM 8192 words × 10 bits (One-Time PROM variant) RAM 280 words × 4 bits CPU 4-bit 4500-series core Timers Timer1: 8-bit (reload) Timer2: 14-bit (watchdog function) Timer LC: 4-bit (reload) I/O Multiple 4-bit ports (P0–P2, Port D) and dedicated segment/common LCD outputs Special Peripherals LCD drive, carrier-wave output, carrier frequency switch, voltage-drop detection Clock External XIN/XOUT (crystal or ceramic resonator) Supply Voltage 2.5 V to 5.5 V Package 48-pin QFP (48P6S-A outline) Applications Infrared remote control transmitters and remote-control systems. Small appliances and consumer devices requiring segmented LCD display and simple control logic. Embedded controllers for simple user-interface devices where integrated timers, LCD drive and IR carrier generation are beneficial. Retro or maintenance replacements for designs using the 4551 family. Package Contents 1× M34551E8FP 4-bit Single-Chip CMOS Microcomputer QFP-48 SMD IC. Documents Datasheet M34551E8FP

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