Keystone Electronics 748

DESCRIPTION

The 7480/7481 group is the single-chip microcomputer adopting the silicon gate CMOS process. In addition to its simple instruction set, the ROM, RAM, and I/O addresses are placed in the same memory space.
Having built-in serial I/O, A-D converter, and watchdog timer, this
single-chip microcomputer is useful for control of automobiles, office automation equipment and home electric appliances. The 7480/7481 group includes multiple types which differ in the memory type, size, and package.

FEATURES

● Number of basic machine language instructions ..................... 71
● Minimum instruction execution time ...................................0.5 µs
(at 8 MHz clock input oscillation frequency)
● Memory size ROM ........................................... 4 K to 16 K bytes
RAM ............................................ 128 to 448 bytes
● Programmable I/O ports .................................... 18 (7480 group)
(P0, P1, P4, P5) 24 (7481 group)
● Input ports ............................................................ 8 (7480 group)
(P2, P3) 12 (7481 group)
● Built-in programmable pull-up transistors (P0, P1)
● Built-in clamp diodes............................................ 2 (7480 group)
(P4, P5) 8 (7481 group)
● Interrupt ................................................... 14 sources, 13 vectors
● Timer X, Y ..................................................................... 16-bit ✕ 2
● Timer 1, 2 ....................................................................... 8-bit ✕ 2
● Serial I/O ....................... 8-bit x 1 (UART or clock-synchronized)
● A-D converter ............................ 8-bit x 4 channels (7480 group)
8-bit x 8 channels (7481 group)
● Built-in watchdog timer
● Power source voltage ................................................ 2.7 to 4.5 V
(at [2.2 VCC-2] MHz clock input oscillation frequency)
4.5 to 5.5 V
(at 8 MHz clock input oscillation frequency)
● Power dissipation .............................................................. 35 mW
(at 8 MHz clock input oscillation frequency and 5 V power source voltage)

APPLICATIONS

Automobiles, office automation equipment, home electric appliances, etc.