DATA SHEET
MOS INTEGRATED CIRCUIT
µPD75104, 75106, 75108
4-BIT SINGLE-CHIP MICROCOMPUTER
DESCRIPTION
µPD75108 is a 4-bit single-chip microcomputer integrating timer/event counters, serial interface, and vector
interrupt function, in addition to a CPU, ROM, RAM, and I/O ports, on a single chip. 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, µPD75108 is suitable for controlling such systems as VTRs, acoustic products, button telephones, radio
www.DataSchoemet4mUu.cnoimcations equipment, and printers. A pin-compatible EPROM model is also available for evaluation of
system development and small-scale production of application systems.
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)
: 8068 × 8 bits (µPD75108)
: 6016 × 8 bits (µPD75106)
: 4096 × 8 bits (µPD75104)
• Data memory (RAM)
: 512 × 4 bits (µPD75108)
: 320 × 4 bits (µPD75106, 75104)
• New architecture “75X series” 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), 5 V
• Power-saving, instruction 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
• Model with PROM is available: µPD75P108B (One-time PROM, EPROM)
Unless there are differences among µPD75104, 75106, and 75108 functions, µPD75108 is treated as the
representative model throughout this manual.
The information in this document is subject to change without notice.
Document No. IC-2520B
(O. D. No. IC-6906B)
Date Published January 1994 P
Printed in Japan
The mark 5 shows major revised points.
© NEC Corporation 1989
