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EM73P982 Datasheet(PDF) 15 Page - ELAN Microelectronics Corp |
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EM73P982 Datasheet(HTML) 15 Page - ELAN Microelectronics Corp |
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15 / 41 page  15 * This specification are subject to be changed without notice. EM73P982 EM73P982 EM73P982 EM73P982 EM73P982 4-BIT MICROCONTROLLER 4-BIT MICROCONTROLLER 4-BIT MICROCONTROLLER 4-BIT MICROCONTROLLER 4-BIT MICROCONTROLLER 12.25.2001 CLOCK AND TIMING GENERATOR CLOCK AND TIMING GENERATOR CLOCK AND TIMING GENERATOR CLOCK AND TIMING GENERATOR CLOCK AND TIMING GENERATOR The clock generator is supported by a single clock system, the clock source comes from crystal (resonator) or RC oscillation is decided by mask option, the working frequency range is 480 K Hz to 4 MHz. CLOCK AND TIMING GENERATOR STRUCTURE CLOCK AND TIMING GENERATOR STRUCTURE CLOCK AND TIMING GENERATOR STRUCTURE CLOCK AND TIMING GENERATOR STRUCTURE CLOCK AND TIMING GENERATOR STRUCTURE The clock generator connects outside compoments (crystal or resonator by XIN and XOUT pin for crystal osc. type, Resistor and capacitor by CLK pin for RC osc type, these two type is decided by mask option). The clock generator generates a basic system clock "fc". When CPU sleeping, the clock generator will be stoped until the sleep condition released. The system clock control generates 4 basic phase signals (S1, S2, S3, S4) and system clock. CLOCK AND TIMING GENERATOR FUNCTION CLOCK AND TIMING GENERATOR FUNCTION CLOCK AND TIMING GENERATOR FUNCTION CLOCK AND TIMING GENERATOR FUNCTION CLOCK AND TIMING GENERATOR FUNCTION The frequency of fc is the oscillation frequency for XIN, XOUT by crystal ( resonator) or for CLK by RC osc. When CPU sleeps, the XOUT pin will be in "high" state. When user choose RC osc, XOUT pin is no used. The instruction cycle equal 8 basic clock fc. 1 instructure cycle = 8 / fc TIMING GENERATOR AND TIME BASE TIMING GENERATOR AND TIME BASE TIMING GENERATOR AND TIME BASE TIMING GENERATOR AND TIME BASE TIMING GENERATOR AND TIME BASE The timing generator produces the system clock from basic clock pulse. 1 instruction cycle = 8 basic clock pulses There are 22 stages time base. When working in the single clock mode, the timebase clock source is come from fc. Time base provides basic frequency for following function: 1. TBI (time base interrupt). 2. Timer/counter, internal clock source. 3. Warm-up time for sleep - mode releasing. XIN/CLK XOUT Crystal connection XIN/CLK XOUT RC connection sleep XIN/CLK XOUT clock generator System clock control fc System clock S1 S2 S3 S4 Mask option Mask option for choose Crystal or RC oscillation fc Prescaler Binary counter 12 3 4 5 6 78 910 11 1213 22 21 20 19 18 17 16 15 14 |
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