SN66085B

SN66085B 4-Channel Speech Controller 1 INTRODUCTION SN66085B is an 85 seconds single chip 4-channel voice synthesizer IC that contains I/O pins and a tiny controller. By programming through the tiny controller, users’ applications including section combination, trigger modes, output status, high performance melody, multiple voices, and other logic functions can be implemented. 2 FEATURES Single power supply 2.4V – 5.1V Built in a tiny controller 85 seconds voice capacity are provided One 4-bit input port, two 4-bit I/O ports and one 4-bit output port are provided 128*4 bits RAM are provided Maximum 64k program ROM is provided Readable ROM code data Built in a high quality speech synthesizer Four independent voice channels Adaptive playing speed from 4k-40kHz is provided for all 4 channels individually Automatic repetition for every channel A 6-bit*8-bit Multiplier is embed to modulate the volume of synthesized voices Two digital mixers (with saturation control) are provided Two 8-bit current output DA converters (Channel 1 + Channel 2 → DA1, Channel 3 + Channel 4 → DA2 ) System clock: 2M Hz ( RC-type or Crystal Option) Low Voltage Reset Ver: 1.1 1 December 6, 2004 SN66085B 4-Channel Speech Controller 3 Block Diagram ROM Program/Speech/Melody/Instrument waveform 256K×12 bits Address Pointers/ STACK SRAM (128 nibbles) Sampling Rate Counter × 4 Timing Generator OSC DA8-bit DA8-bit IO4 IO1 Timer ALU IO2 Voice Synthesizer IO3 4 PIN ASSIGNMENT Symbol P13, P12, P11, P10 P23, P22, P21, P20 P33, P32, P31, P30 P43, P42, P41, P40 VDD GND OSC/XIN XOUT CKSEL I/O Function Description I Bit3 ~ Bit0 of input port 1 I/O Bit3 ~ Bit0 of I/O port 2 I/O Bit3 ~ Bit0 of I/O port 3 O I I I O I Bit3 ~ Bit0 of output port 4 Positive power supply Negative power supply Oscillator / Crystal In Crystal Out Clock type select ‘L’ or floating → RC oscillator ‘H’ →Crystal D/A current output, for channel 1 and 2 D/A current output, for channel 3 and 4 2 VO1 VO2 O O Ver: 1.1 December 6, 2004 SN66085B 4-Channel Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SN66085B accepts crystal oscillator / ceramic resonator or RC type oscillator (selected by pin CKSEL) for system clock. The typical circuit diagrams for oscillator are listed as follows. VDD VDD 20pf CKSEL OSC/XIN XOUT CKSEL OSC/XIN XOUT 20pf 2MHz Crystal / Resonator RC Oscillator 5.2. ROM SN66085B contains 256K word (12-bit) internal ROM. Program, voices, melodies, data, and instrument waveforms share the same ROM with the others. 5.3. RAM SN66085B contains 128 nibble RAM. The 128 nibble RAM is separated into two pages (page 0 and page 1). An implicit page indicator is utilized to specify page address. Two instructions, PAGE0 and PAGE1, can switch the page indicator. All 64 nibbles of each page can be accessed by direct mode (to specify M0 ~ M63 in the data transfer type instructions.) 5.4. Power Down Mode “End” instruction will let SN66085B enter power down mode and consumer very little amount of current. (