描述 Description

GPC74C, a 4-bit sound controller, is architected with a four-channel SPU for MIDI playback, a 4-bit RISC CPU, a 14-bit PWM, 8/16 IOs and 1 input pin (with pull low resistor ) , 256-nibble RAM, and embedded ROM with density of 32K/ 64K/ 96K/ 128K/ 160K/ 340K/ 680K x 12-bit of memory space. The operating voltage ranges from 2.0V through 5.5V and operating speed is 1M/2MHz, configurable through inner oscillator. Other features include Low Voltage Reset, IR carry output, Watchdog, five interrupt sources with two time-bases, etc.

特性 Features

? 4-bit RISC CPU
? CPU Clock: 1M/2M Hz, System clock: 8MHz
? Operating Voltage: 2.0V - 5.5V
? Regulator built-in with input voltage: 2.0~5.5V, output voltage: 2.0~3.0V
? IO: IOA~IOD, IOH3 Operating Voltage: 2.0V - 5.5V
? 256 nibbles SRAM
? n14-bit PWM driver for driving speaker directly
? 32K/64K/96K/128K/160K/340K/680K x12-bit ROM for different body
? Standby mode for power savings
? Five interrupt sources with two Time-bases
? 4-channel Sound Processing Unit (SPU) supporting MIDI playback
? 8/16 general IOs (bit programmable), one input pin with pull low resistor
? Key wakeup function
? Low voltage reset
? Watchdog
? Low Voltage Detection 7-level (2.2V/ 2.4V/ 2.6V/ 2.8V/ 3.0V/ 3.3/ 3.6V) voltage detector