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EM73880 Datasheet(PDF) 27 Page - ELAN Microelectronics Corp |
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EM73880 Datasheet(HTML) 27 Page - ELAN Microelectronics Corp |
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27 / 40 page ![]() 27 * This specification are subject to be changed without notice. EM73880 EM73880 EM73880 EM73880 EM73880 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 11.30.2001 Preliminary Preliminary Preliminary Preliminary Preliminary RESETTING FUNCTION RESETTING FUNCTION RESETTING FUNCTION RESETTING FUNCTION RESETTING FUNCTION When CPU in normal working condition and RESET pin holds in low level for three instruction cycles at least, then CPU begins to initialize the whole internal states, and when RESET pin changes to high level, CPU begins to work in normal condition. The CPU internal state during reset condition is as following table : Hardware condition in RESET state Initial value Program counter 0000h Status flag 01h Interrupt enable flip-flop ( EI ) 00h MASK0 ,1, 2, 3 00h Interrupt latch ( IL ) 00h P4, P5, P10, 11,14, 16, 19, 25, 27, 28, 29, 31 00h P4, 8, 17, 23, 24 0Fh Both oscillator Start oscillation The RESET pin is a hysteresis input pin and it has a pull-up resistor available by mask option. The simplest RESET circuit is connect RESET pin with a capacitor to V SS and a diode to VDD. RESET |
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