7478

Features:

Basic machine-language instructions ...................................... 71
Memory size
   ROM.................................... 8192 bytes (M37477M4, M37478M4)
   RAM ...................................... 192 bytes (M37477M4, M37478M4)
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
   ......................................... 96 levels max. (M37477M4, M37478M4)
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)


Pinout




Specifications

Symbol	Parameter	Conditions	Ratings	Unit
VCC	Power source voltage	All voltages are based on VSS. Output transistors are cut off	0.3 to 7	V
VI	Input voltage XIN		0.3 to VCC +0.3	V
VI	Input voltage P00 P07, P10 P17, P20 P23, P30 P33, P40, P41, VREF, RESET		0.3 to VCC +0.3	V
VO	Output voltage P00 P07, P10 P17, P40, P41, XOUT		0.3 to VCC +0.3	V
Pd	Power dissipation	Ta = 25°C	1000 (Note)	mW
Topr	Operating temperature		20 to 85	°C
Tstg	Storage temperature		40 to 150	°C

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.
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In addition, built-in PROM type microcomputers with built-in elec-trically 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.