SNC552

SNC552 Two Channel Direct Drive Speech Controller 1 INTRODUCTION SNC552 is a two-channel voice synthesizer IC with PWM direct drive circuit. It built-in a 4-bit tiny controller with one 4-bit input port and two 4-bit I/O ports. By programming through the tiny controller in SNC552, user’s varied applications including voice section combination, key trigger arrangement, output control, and other logic functions can be easily implemented. 2 FEATURES Single power supply 2.4V – 5.5V 20 seconds voice capacity are provided(@6KHZ sample rate) Built in a 4-bit tiny controller One 4-bit input port and two 4-bit I/O ports are provided 128*4 bits RAM are provided 64K*10 ROM size are provided for voice data and program Maximum 16k program ROM is provided Readable ROM code data IR carrier signal is provided Built in a high quality speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided Two independent voice channels (Channel 1 + Channel 2→Buo1,Buo2) Built in a PWM Direct Drive circuit and a fixed current D/A output System clock : 2MHz Low Power Reset Ver: 1.4 1 June 8, 2005 SNC552 Two Channel Direct Drive Speech Controller 3 Block Diagram ROM Program/Speech 64K×10 bits Address Pointers/ STACK SRAM (128 nibbles) Timer ALU IO1 Timing Generator OSC Sampling Rate Counter × 2 PWM D/A IO3 Voice Synthesizer IO2 4 PIN ASSIGNMENT Symbol P13 ~ P10 P23 ~ P20 P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O I I/O I/O P P I O O O Function Description Bit3 ~ Bit0 of Input port 1 Bit3 ~ Bit0 of I/O port 2 Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Reset pin (active high) Oscillator / Crystal Out Positive Output of PWM or DA output Negative Output of PWM Ver: 1.4 2 June 8, 2005 SNC552 Two Channel Direct Drive Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SNC552 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. VCC RC Oscillator 5.2. ROM SNC552 contains substantial 64K words (10-bit) internal ROM. Program, voices and other data are shared with this same 64K words ROM. 5.3. RAM SNC552 contains 128 nibbles RAM. The 128 nibbles RAM are divided into eight pages (page 0 to page 7, 16 nibble RAM on each page). In our programming structure, users can easily define and locate RAM page in the program. For instance, users can use the instructions, PAGEn (n=0 to 7) to switch and indicate the RAM page. Besides, users can use direct mode, M0 ~ M15 in the data transfer type instructions, to access all 16 nibbles of each page. 5.4. Power Down Mode “End” instruction will power down SNC552 and enable IC to consume fewer current for power saving. (