EM73982 Просмотр технического описания (PDF) - ELAN Microelectronics
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EM73982 Datasheet PDF : 41 Pages
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EM73982
4-BIT MICROCONTROLLER
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
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.
XIN/CLK
XOUT
Mask option sleep
Mask option for choose Crystal or RC oscillation
clock generator fc System clock control System clock
XIN/CLK
XOUT
XIN/CLK
XOUT
S1 S2 S3 S4
Crystal connection RC connection
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
The timing generator produces the system clock from basic clock pulse.
1 instruction cycle = 8 basic clock pulses
There are 22 stages time base.
Prescaler
Binary counter
fc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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.
* This specification are subject to be changed without notice.
11.30.2001 15
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