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SNC539 Datasheet(PDF) 3 Page - SONiX Technology Company |
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SNC539 Datasheet(HTML) 3 Page - SONiX Technology Company |
3 / 12 page SNC539 Two Channel Direct Drive Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SNC539 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. OSC VCC RC Oscillator 5.2. ROM SNC539 contains substantial 40K words (10-bit) internal ROM. Program, voices and other data are shared with this same 40K words ROM. 5.3. RAM SNC539 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 SNC539 and enable IC to consume fewer current for power saving. (<3uA @VDD=3V and <5uA @VDD=5V) Please be aware that when the power down mode is activated in SNC539, any valid data transition (L H or H L) occurring on any input port (P1) or IO ports (P2, P3 and P6) will lead SNC539 back to normal operation mode. 5.5. Sampling Rate Counters Ver: 1.3 August 26, 2003 3 2 independent sampling rate counters are dedicated to 2 individual voice channels to be able to play diverse voices at different sample playing rates. The playing rate can be adaptively set up among from the wide ranges of 2.5KHz to 20KHz. This feature makes voice close to its original source and yield the better voice quality. |
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