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PCA84C840 Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA84C840 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 40 page 1996 Nov 29 8 Philips Semiconductors Product specification 8-bit microcontrollers with OSD and VST 84C44X; 84C64X; 84C84X 7 RESET The RESET pin (active LOW input) is used to initialize the microcontroller to a defined state. The Reset configuration is shown in Fig.5. Fig.4 External components for RESET pin. andbook, halfpage VSS DD V R ≤ 100 kΩ C RESET MCD174 7.1 Power-on-reset The Power-on-reset circuit monitors the voltage level of VDD. If VDD remains below the internal reference voltage level Vref (typically 1.3 V), the oscillator is inhibited. When VDD rises above Vref, the oscillator is released and the internal reset is active for a period of td (typically 50 µs). Considering the VDD rise time, the following measures for a correct Power-on-reset can be taken: • If the VDD rises above the minimum operation voltage before time period td is exceeded, no external components are necessary (see Fig.6). • If V DD has a slow rise time, such that after the time period (tVref +td) has elapsed the supply voltage is still below the minimum operation voltage (Vmin), external components are required (see Figs 4 and 7). To guarantee a correct reset operation, ensure that the time constant RC ≥ 8 × tVDD. A definite Power-on-reset can be realized by applying an (external) RESET signal during power-on. Fig.5 Reset configuration. handbook, full pagewidth MLA651 V SS DD V RESET POWER-ON-RESET oscillator inhibit ref V internal reset |
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