illustrate
Reference: "ispMACH 4000ZE Family"
《Advanced Features of the ispMACH 4000ZE Family》
《Power Estimation in ispMACH 4000ZE Devices》
Software tools: isplever classic 2.1
The maximum output of the internal crystal oscillator is a 5MHz clock; isplever classic 2.1 does not give a power report, but officially provides a calculation formula for estimating the power consumption of the design; this document introduces the method of using the internal crystal oscillator in the design through an example of a frequency divider, and calculates the power consumption of the design based on the generated design report; this design realizes the frequency division output of the internal crystal oscillator clock, and has a reset input signal and a frequency division output signal.
Use of Internal Crystal Oscillator
Structure diagram (TIMER_DIV is the frequency division parameter, the rest are ports)
port description
Combined with this figure, it is inferred that the timer is reset when TIMERRES is high, and the timer works when it is low; combined with official code resources, it is inferred that the entire crystal oscillator is disabled when DYNOSCDIS is high, and the crystal oscillator is started when low.
primitive language
Instantiate in your own code
Here the timer is reset, the 5MHz clock of the crystal oscillator is enabled, and the clk_osw is 5MHz
Mapped report
Calculation of power consumption
The power consumption calculation uses the formula given in the manual to calculate and evaluate
In this way, the relevant parameters can be given in combination with this design:
A: Device fixed parameter, 0.010 (mA)
B: Device fixed parameter, 0.009 (mA/MHz)
N: device fixed parameters, 32 Macrocells
Fmax: only 5Mhz crystal oscillator clock is used here
AF: 0.125 (the design occupies 4 macrocells, a total of 32 devices, 4/32)
Iccosc：15uA
Fn: The frequency of the output pin, here is 1.25MHz
Cn: take 0.020
Voh-Vol: Check the data sheet, take 1.6V-0.2V=1.4V
m: There is only one output pin here, take 1
Combining parameters and formulas, the calculation can be
ICC =0.010mA+(0.009*32*5*0.125)mA+(0.020*1.4*1.25)mA+0.015mA
=0.010mA+0.18mA+0.035mA+0.015mA
=0.24mA=240uA