描述 Description

The GPCH4256B embedded with 8-bit processor, 256K bytes ROM chip, 512 bytes working SRAM, three set of 12-bit timers, 24 general I/Os, and one 12-bit DAC. The microprocessor can implement software based on audio processing, functional control and others. For audio processing, melody and speech can be mixed into one output. The GPCH4256B implement a high performance SPU voice engine to achieve 4 channel voice with ADPCM/PCM. It operates over a wide voltage range from 2.4V through 5.5V, and it includes a low voltage reset to assure system operating appropriately under low voltage condition. In addition, GPCH4256B provides sleep mode for power savings. It can be awakened from sleep mode by external interrupt sources or IOA status changes.

特性 Features

? Working Voltage: 2.4V - 5.5V
? CPU speed: 7.159MHz
? FOSC = 14.318MHz (2 x CPU clock)
? ROM size: 256K bytes
? RAM size: 512 bytes. (Programmable RAM 384 bytes)
? Three 12-bit timers/counters, TMA/TMB/TMC (Programmable and Auto Reload)
? Sleep mode to save power
? Key change wakeup function
? 10 IRQs & 6 NMI Interrupts
? Watchdog function
? Low Voltage Reset Function
? 24 general I/Os, including 8 general/special I/Os (All bit programmable)
? 8-bit I/O with high sink current(20mA), especially for LED applications
? IOA with 1M pull low function to prevent current leakage from error key touch
? One 12-bit DAC outputs (D/A output: 4mA/channel)
? SPU(Sound Processing Unit) engine exports 15-bit resolution audio data with 12-bit DAC to produce high quality sound
? IR PWM Output
? 4-channel SPU engine with ADPCM/PCM wave table
? Tone color (Speech) with ADPCM algorithm to save memory usage