UPD75108A

DATA SHEET MOS INTEGRATED CIRCUIT µPD75104A, 75108A 4-BIT SINGLE-CHIP MICROCOMPUTER DESCRIPTION µPD75108A is a 4-bit single-chip CMOS microcomputer having a data processing capability comparable to that of an 8-bit microcomputer. Operating at high speeds, the microcomputer allows data to be manipulated in units of 1, 4, or 8 bits. In addition, various bit manipulation instructions are provided to reinforce I/O manipulation capability. Equipped with I/Os for interfacing with peripheral circuits operating on a different supply voltage, outputs that can directly drive LEDs, and analog inputs, µPD75108A is suitable for controlling such small equipments as cameras and VCRs. Detailed functions are described in the following user’s manual. Be sure to read it for designing. µPD751XX Series User’s Manual: IEM-922 FEATURES Internal memory Program memory (ROM) : 8064 × 8 bits (µ PD75108A) : 4096 × 8 bits (µ PD75104A) Data memory (RAM) : 512 × 4 bits ( µPD75108A) : 320 × 4 bits ( µPD75104A) Architecture “75X” rivaling 8-bit microcomputers 43 systematically organized instructions A wealth of bit manipulation instructions 8-bit data transfer, compare, operation, increment, and decrement instructions 1-byte relative branch instructions GETI instruction executing 2-/3-byte instruction with one byte High speed. Minimum instruction execution time: 0.95 µs (at 4.19 MHz, 5V) Instruction execution time change function: 0.95 µs/1.91 µs/15.3 µ s (at 4.19 MHz) I/O port pi...