DESCRIPTION

The 7477/7478 group is the single-chip microcomputer designed with CMOS silicon gate technology.

The single-chip microcomputer is useful for business equipment and other consumer applications.

In addition to its simple instruction set, the ROM, RAM, and I/O addresses are placed on the same memory map to enable easy programming.

In addition, built-in PROM type microcomputers with built-in electrically writable PROM, and additional functions equivalent to the mask ROM version are also available.

7477/7478 group products are shown noted below. The 7477 and the 7478 differ in the number of I/O ports, package outline, and clock generating circuit only.

FEATURES

● Basic machine-language instructions ...................................... 71

● Memory size

ROM................. 16384 bytes (M37477M8/E8, M37478M8/E8)

RAM ..................... 384 bytes (M37477M8/E8, M37478M8/E8)

● The minimum instruction execution time

......................................0.5μs (at 8MHz oscillation frequency)

● Power source voltage

.......... 2.7 to 4.5V (at 2.2VCC – 2.0MHz oscillation frequency)

............................. 4.5 to 5.5V (at 8MHz oscillation frequency)

● Power dissipation in normal mode

.................................... 35mW (at 8MHz oscillation frequency)

● Subroutine nesting

................... 192 levels max. (M37477M8/E8, M37478M8/E8)

● Interrupt .................................................... 13 sources, 11 vectors

● 8-bit timers ................................................................................. 4

● Programmable I/O ports

(Ports P0, P1, P4) .......................................... 18 (7477 group)

20 (7478 group)

● Input ports (Ports P2, P3) .................................... 8 (7477 group)

(Ports P2, P3, P5) ............................16 (7478 group)

● 8-bit serial I/O ........................... 1 (UART or clock-synchronized)

● 8-bit A-D converter ................................ 4 channels (7477 group)

8 channels (7478 group)

APPLICATIONS

Audio-visual equipment, VCR, Tuner,

Office automation equipment

Extended operating temperature range version

……………………………………………… Automotive controls