e-ICE User’s Guide
10
If the red frame is unchecked, the DEV operating frequency will not be supplied by the
MEV Board.
If the red frame is checked, the MEV Board provides frequencies as listed in the following table.
The MEV Board provided frequencies are integer divisions of 24MHz : 24 / N (N=2, 3, 4 … 60) and
32.768kHz.
Divider 24/2 24/3 24/4 24/5 24/6
Frequency 12MHz 8 MHz 6 MHz 4.8 MHz 4MHz
Divider 24/7 24/8 24/9 24/10 24/11
Frequency 3.428571MHz 3 MHz 2.666666MHz 2.4 MHz 2.181818MHz
Divider 24/12 24/13 24/14 24/15 24/16
Frequency 2 MHz 1.846153MHz 1.714285MHz 1.6MHz 1.5 MHz
Divider 24/17 24/18 24/19 24/20 24/21
Frequency 1.411764MHz 1.333333MHz 1.263157MHz 1.2 MHz 1.142857MHz
Divider 24/22 24/23 24/24 24/25 24/26
Frequency 1.090909MHz 1.043478MHz 1MHz 960kHz 923.077kHz
……
Divider 24/57 24/58 24/59 24/60 RTC
Frequency 421.052kHz 413.793kHz 406.779kHz 400kHz 32.768kHz
Table 1 MEV Board provided frequencies
The MEV Board can offer frequency division ratios as listed in Table 1. For other
frequency selections an external oscillator is required.
The e-ICE can support a max system frequency of 20MHz. However as the MEV Board
is unable to divide a 20MHz frequency, external components will be required.
Voltage and Current
The e-ICE operating voltage can be set freely to a range of 2.2V~5.5V which is
different from the HT-ICE which can only operate at either 5V or 3.3V.
As the figure below shows, ensure that the emulator operates at the correnct voltage
using the SysVolt setting.
Figure 15 SysVolt Frequency Setup Window
When the e-ICE uses an external VDD as the power supply, ensure that the external
power is stable and is not greater than 5.5V before connecting it to the VEXT and VSS
pins of the DEV Board. The J8 jumper should be connected between pins 2-3. When
switching the external power supply on or off, it is possible that instantaneous large
voltages or currents may be generated. Therefore remember to remove the external
power from the DEV Board before shutting down the power.
When jumper J8 is connected between pins 1-2, then power will be supplied by the
internal VDD. Here the maximum current consumption is 300mA. If the power
consumption exceeds this value, then jumper J8 must be connected between pins 2-3
and power supplied on VEXT using an external power supply.
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