ST STM8/128-EVAL, Руководство пользователя

Страница: 14 / 19

Demonstration applications UM0501
18/23 Doc ID 14320 Rev 3
2.13 SYSTEM demo
This menu is used to display system information.
The message displayed on the LCD screen shows the clock source which is used (HSI, LSI
or LSE) (see
Figure 23 ).
Figure 23. Displaying the clock source
Pressing SEL on the joystick displays the clock frequency (see Figure 24 ).
Figure 24. Displaying the clock frequency
Press SEL again to go back to the first screen.
During any of the above two messages, you can press KEY repeatedly to divide the HSI
clock frequency by a divider factor (1, 2, 4, 8, 1,....). The new clock frequency is then
displayed.
You can monitor the master clock frequency with an oscilloscope connected to the MCO pin.
Note: If you select an HSI divider greater than 1, you slow down the whole application. As a result,
you will need to press the buttons for longer in order to navigate the menus.
UP : Press the joystick UP to exit this menu.
2.14 About menu
This menu shows the firmware version. When this submenu is selected the message shown
in
Figure 25 is displayed on the LCD screen.
Figure 25. Displaying the demonstration firmware version
UP : Press the joystick UP to exit this menu.
CLOCK SOURCE
HSI
CLOCK FREQ
16 MHz
STM8/128-EVAL
Version x.y.z