DESCRIPTION
The µPD7554A is a product of the µPD7554, 7564 sub-series which is a 4-bit single-chip microcomputer with a small number of ports in a small package, which is enabled to operate even at the super-low voltage of 2.0 V so that it is optimized for handy-type systems operating with dry cells. The µPD7554A is a low-order model in the µPD7500 series (µPD7554A only).
This device incorporates a serial interface, and serves as the sub-CPU for a high-order model of that series or the 8-bit microcomputer. It is optimized for distributed processing of the system. The µPD7554A has outputs to directly drive a triac and LEDs and allows selection among many types of input/output circuits using their respective mask options, sharply reducing the number of external circuits required.

FEATURES
• Range of supply voltage 7554A : 2.0 to 6.0 V Z  7554A(A) : 2.7 to 6.0 V
• Drive with two 1.5 V manganese cells
• 47 types of instructions (Subset of µPD7500H SET B)
• Instruction cycle External clock : 2.86 µs (in operation at 700 kHz, 5 V)  RC oscillation : 4 µs (in operation at 500 kHz, 5 V)
• Program memory (ROM) capacity: 1024 × 8 bits
• Data memory (RAM) capacity: 64 × 4 bits
• Test source: One external source and two internal sources
• 8-bit timer/event counter
• 16 I/O lines (Total output current of all pins: 100 mA)
• Can directly drive a triac and a LED: P80 to P83
• Can directly drive LEDs: P100 to P103 and P110 to P113
• Mask option function provided for every port
• 8-bit serial interface
• Standby (STOP/HALT) function
• Low supply voltage data retaining function for data memory
• Built-in ceramic oscillator for system clock RC Oscillation with an external resistor R (Incorporating capacitor C)

APPLICATION
    µPD7554A : Sub-CPU including handy-type system, PPC, printer, VCR, audio equipments, etc.
    µPD7554A(A) : Automotive and transportation equipments, etc.