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.

FEATURES
• Internal memory
• Program memory (ROM)
: 8064 × 8 bits (µPD75108A)
: 4096 × 8 bits (µPD75104A)
• 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 µs (at 4.19 MHz)
• I/O port pins as many as 58
• Three channels of 8-bit timers
• 8-bit serial interface
• Multiplexed vector interrupt function