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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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GPC10048A-NnnV-C Fiches technique(PDF) 7 Page - Generalplus Technology Inc. |
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GPC10048A-NnnV-C Fiches technique(HTML) 7 Page - Generalplus Technology Inc. |
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7 / 15 page  GPC10048A © Generalplus Technology Inc. Proprietary & Confidential 7 May 15, 2008 Version: 1.3 FIG. 1 T1 = 1 / ( FCPU ), Tw ≧64 x T1 6.7. Low Voltage Reset The GPC10048A has a Low Voltage Reset (LVR) function. In general, the CPU becomes unstable and malfunctions when the power voltage drops below certain operating voltage. With the unique design of Low Voltage Reset in GPC10048A, it is able to reset all functions to the initial operational (stable) state if the VDD power-supply voltage drops below 1.8V. T2 Tw T2≧2 * T1 T1 VDD CPU CLK RESET 1.8V (The LVR function is the same as Power ON Reset or External Reset.) 6.8. Timer/Counter The GPC10048A has two 8-bit timer/counters, TMA and TMB respectively. TMA can be specified as a timer, but TMB can be used as a timer or a counter. In the timer mode, TMA and TMB are re-loaded up-counters. When timer rollovers from $FF to $00, the carry (overflow) signal will make the user’s preset value to be loaded into timer automatically and up-count again. At the same time, the carry signal will generate an INT signal if the corresponding bit is enabled in the INT ENABLE Register. Suppose TMB is specified as a counter, users can reset it by loading #0 into the counter. After the counter has been activated, the value in the counter can also be read at the same time. The read instruction will not affect the value of the counter nor reset it. Clock source of Timer/Counter can be selected as follows: Timer/Counter Clock Source TMA 8-BIT TIMER CPU CLOCK (T) or T/8, T/64, TMB overflow TMB 8-BIT TIMER T, T/65536, EXTCLK, 0, 1 6.9. Speech and Melody In speech synthesis, the GPC10048A can use NMI for accurate sampling frequency. The user can store the speech data in ROM and play it back with realistic sound quality. Several algorithms are recommended for high fidelity and compression of sound: PCM, LOG PCM, ADPCM and SACMA3400. T1 Tw Wake-up CPU CLK SLEEP RESET |
Numéro de pièce similaire - GPC10048A-NnnV-C |
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Description similaire - GPC10048A-NnnV-C |
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