The eSB series IC's are 4-bit microcontroller based sound processor with twochannel speech audio function. The series has a powerful 4-bit CPU that handles most of the speech functions. Wide range of sampling rates and diverse volume levels are supported. It provides a synthesized speech to obtain good quality speech as well as one 4-bit input port, three 4-bit I/O ports, and one 4-bit output port (applicable to eSB100/120/170/200/270/320). By programming through the microcontroller, applications, such as section combination, trigger mode, output control, keyboard matrix, and other logic functions are easily put into effect.
In addition to Sleep mode, the eSB series IC's also offer Green mode which allows continuous operation at reduced or very low power consumption. Normal operation resumes at a preset time.
The enhanced functions will facilitate users in creating a wide variety of devices with new fancy features.

Features

• System clock:
          * 4 MHz @ 2.2 volts ~ 5.1 volts.
          * 6 MHz @ 2.4 volts ~ 5.1 volts
• Auto optional crystal oscillator or RC oscillator.
• Input/Output ports:
          * One Input port (P1) with software controlled pull low resistor.
          * Three input / output ports (P2 ~ P4):
             P2 & P3 are software controlled with pull low resistor and wakeup function.
             P4 is applicable to eSB065/080/100/120/170/ 200/270/320.
          * One output port (P5) applicable to eSB100/120/170/200/270/320.
• Sleep mode to conserve power, less than 1uA @ 3V standby current.
• Green mode for continuous operation at reduced or very low power consumption (less than 15uA @ 3V).
• 4 bits RISC type controller, each instruction takes 2 (90%) or 4 clock cycles.
• 12 bits width per instruction, each instruction takes 1 (90%) or 2 words.
• Total of 4 interrupts are available:
          * 2 interrupts for two speech channels operation.
          * 1 interrupt for timer.
          * 1 general purpose external interrupt.
• 32K words maximum program address (except for eSB015 which has 28K words max).
• 8 total stacks.
• 128 nibbles RAM.
• Two channels can be arbitrarily assigned as speech Channel 1 or Channel 2.
• PCM/ADPCM algorithm for speech synthesis, which is transparent to users.
• 16 steps DA volume control for channel output.
• Optional 8 bits PWM or 10 bits traditional current DA.
• 4 Flash with volume level options: 1/2, 1/4, 1/8/, & 1/16.