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