Keil MCB517AC, Руководство пользователя

Страница: 14 / 61

8 Chapter 2. Setup
LED: Default ON
The LED switch selects whether or not port 4 is connected to the 8 LEDs in the
upper right portion of the board. When LED is ON, the LEDs on port 4 are
enabled. When LED is OFF, the LEDs are not connected to port 4. If you work
with the Monitor DIP switch ON and LED is OFF, then you select also a
Monitor version which does no longer modify the port 4 lines.
OWEoff : Default ON
The OWEoff switch enables or disables the on chip oscillator watchdog. If
OWEoff is ON, the oscillator watchdog is disabled. If OWEoff is OFF, the
oscillator watchdog supervises the crystal frequency and generates a reset if it is
below 1 MHz.
PE/Soff: Default ON
The PE/Soff switch enables or disables the watchdog timer as well as the power
saving modes. If PE/Soff is ON, the watchdog timer is off by default and the
software is able to enter the power down, idle and slow down mode. If PE/Soff
is OFF the watchdog timer is automatically started and the power saving modes
are blocked. When you are using Monitor 51 this switch has to be in ON
position.