SPC500A3 Sunplus Technology Co., Ltd., SPC500A3 Datasheet - Page 7

• Manufacturer Part Number: SPC500A3
• Description: 512KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

6.10. Low Voltage Reset
The SPC500A3 provides a Low Voltage Reset (LVR) function.
Below the minimum power-supply voltage of 2.2V, the CPU
system will become unstable and malfunction.
6.11. Timer/Counter
The SPC500A3 contains two 12-bit timer/counters, TMA and TMB
respectively. TMA can be specified as a timer or a counter, but
TMB can only be used as a timer. In the timer mode, TMA and
TMB are re-loaded up-counters.
$0FFF to $0000, the carry signal will make the timer automatically
reload to the user’s pre-set value and be up-counted again. At
the same time, the carry signal will generate the INT signal if the
corresponding bit is enabled in the INT ENABLE Register. If TMA
is specified as a counter, users can reset by loading #0 into the
counter. After the counter has been activated, the value of the
counter can also be read from the counters at the same time.
Clock source of Timer/Counter can be selected as follows:
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Proprietary & Confidential
MODE SELECT REGISTER TMA only, select timer or counter
TIMER CLOCK SELECTOR Select T or T/4
TMA
TMB
CPU CLK
RESET
Timer/Counter
VDD
2.2V
12-BIT TIMER
12-BIT COUNTER
12-BIT TIMER
CPU CLOCK (T) or T/4
T/64, T/8192, T/65536 or EXT CLK
T or T/4
T1
When timer overflows from
(The LVR function is the same as Power ON Reset or External Reset.)
Clock Source
T2
Low Voltage
T2
≧
2 * T1
FIG. 2
7
Reset will reset all functions into the initial operational (stable)
state if the VDD power-supply voltage drops below 2.2V (See
FIG.2).
6.12. Speech and Melody
Since the SPC500A3 provides a large ROM and wide range of
CPU operation speeds, it is most suitable for speech and melody
synthesis.
NMI for accurate sampling frequency.
synthesize the sound and digitize it into the ROM. The sound
data can be played back in the sequence of the control functions
as designed by the user's program.
recommended for high fidelity and compression of sound including
PCM, LOG PCM, and ADPCM.
SPC500A3 provides the dual tone mode. After selecting the dual
tone mode, users only need to fill either TMA or TMB, or both TMA
and TMB to generate expected frequency for each channel. The
hardware will toggle the tone wave automatically without entering
into an interrupt service routine.
musical instruments or sound effects by simply controlling the
envelope of tone output.
6.13. Serial Interface I/O
The SPC500A3 provides serial interface I/O mode for those
applications requiring large ROM/RAM. Serial Interface I/O Port
can be used to read/write data from/to extra memory.
interface I/O Register is the control register for programming
interface I/O.
For speech synthesis, the SPC500A3 can provide
T
W
Users are able to simulate
For melody synthesis, the
SPC500A3
Several algorithms are
Users can record or
JUL. 30, 2001
Version: 1.0
The