SN52020

SN52020 2-Channel Speech Controller ========================== CONTENTS =========================== 1. 2. 3. 4. 5. INTRODUCTION............................................................................................................ 3 FEATURES ...................................................................................................................... 3 BLOCK DIAGRAM ........................................................................................................ 4 PIN ASSIGNMENT ......................................................................................................... 4 FUNCTION DESCRIPTIONS ....................................................................................... 5 5.1. 5.2. 5.3. 5.4. 5.5. 5.6. 5.7. 5.8. 5.9. 5.10. 5.11. 5.12. 6. 7. 8. 9. OSCILLATOR ............................................................................................................... 5 ROM .......................................................................................................................... 5 RAM .......................................................................................................................... 5 POWER DOWN MODE .................................................................................................. 5 SAMPLING RATE COUNTERS ....................................................................................... 5 AUTO REPETITION ....................................................................................................... 6 WAVE MARK .............................................................................................................. 6 PUSH-PULL OUTPUT .................................................................................................... 6 VOLUME CONTROL FUNCTION .................................................................................... 6 WATCH DOG ........................................................................................................... 7 I/O PORTS ............................................................................................................... 7 PULL-LOW RESISTER CONTROL .............................................................................. 7 ABSOLUTE MAXIMUM RATING .............................................................................. 8 ELECTRICAL CHARACTERISTICS ......................................................................... 8 APPLICATION CIRCUIT ............................................................................................. 9 DISCLAIMER................................................................................................................ 11 Ver: 1.0 1 March 2,2005 SN52020 2-Channel Speech Controller AMENDENT HISTORY Version Ver 1.0 Ver 1.1 May 25,2005 Date First issue Add RST pin Description Description Ver: 1.0 2 March 2,2005 SN52020 2-Channel Speech Controller 1. INTRODUCTION SN52020 is a 20 seconds single chip 2-channel voice synthesizer IC which 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 – 5.5V Built in a tiny controller 20 seconds voice capacity are provided 64*4 bits RAM are provided ROM Size − Maximum 64K*10 bits ROM size − 64K program ROM is provided Readable ROM code data I/O Ports − One 4-bit I/O ports P3 − The driving/sink current of P3.2 & P3.3 are 8mA/16mA Built in a high quality speech synthesizer Two independent voice channels Adaptive playing speed from 4k-40kHz is provided for all 2 channels individually A 6-bit*8-bit Multiplier is embed to modulate the volume of synthesized voices One digital mixers (with saturation control) are provided Built in an 8-level volume control Analog Push-Pull Direct Drive circuit. System clock: 2M Hz (RC-type or Crystal Option) Low Voltage Reset Built-in WDT function Built-in Event Mark Function Ver: 1.0 3 March 2,2005 SN52020 2-Channel Speech Controller 3. Block Diagram ROM Program/Speech/Instrument waveform Address Pointer PC/Data Pointer/Stack/Speech Pointer SRAM Timer ALU IO3 Timing Generator OSC Sampling Rate Push Pull WDT Voice Synthesizer 4. PIN ASSIGNMENT Symbol P33, P32, P31, P30 VDD GND OSC/XIN XOUT CKSEL I/O I/O I I I O I Function Description Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Oscillator / Crystal In Crystal Out / 1Khz output Clock type select ‘L’ or floating → RC oscillator ‘H’ →Crystal Positive Output of Push Pull Negative Output of Push Pull RST=1 Reset Chip (Active H) BUO1 BUO2 RST O O I Ver: 1.0 4 March 2,2005 SN52020 2-Channel Speech Controller 5. FUNCTION DESCRIPTIONS 5.1. Oscillator SN52020 series 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 SN52000 CKSEL OSC/XIN XOUT 15pf SN52000 CKSEL OSC/XIN XOUT 2MHz Crystal / Resonator 5.2. ROM 15pf RC Oscillator SN52020 contains 64K word (10-bit) internal ROM. Program, voices, melodies, data, and instrument waveforms share the same ROM with the others. 5.3. RAM SN52020 series contains 64 nibble RAM. The 64 nibble RAM is separated into four pages (page 0, page1, page2 and page 3). An implicit page indicator is utilized to specify page address. Four instructions, PAGE0, PAGE1, PAGE2 and PAGE3, can switch the page indicator. All 16 nibbles of each page can be accessed by direct mode (to specify M0 ~ M15 in the data transfer type instructions.) 5.4. Power Down Mode “End” instruction will let SN52020 enter power down mode and consumer very little amount of current. (