Keil MCB517AC, Руководство пользователя

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MCB517AC Evaluation Board User’s Guide 9
Configuration Jumper
The following sections describes the configuration jumper of the MCB517AC
board.
80C517 / 80C517A: Default 80C517A
This configuration jumper selects whether the MCB517AC board operates with a
80C517 or a 80C517A CPU. It switches the CPU pin 60 from V
SS
to V
CC
. This
pin has to be connected to V
SS
(circuit ground) for an 80C517. For an 80C517A
this pin is a hardware reset and power down input (\HWPD). It has to be
connected to V
CC
(high level) for normal operation.
Monitor Modes
The MCB517AC board comes with an Monitor EPROM which contains 16
different Monitor configurations. Most of the Monitor configurations are
required to use different serial interfaces and baudrates. The other configurations
determine whether the normal or the banked Monitor should be used and whether
the Monitor should flash the LED’s or not.
DIP Switch Monitor Mode
S3 and S4 Refer to “S3 and S4 DIP Switch“ on page 6 which serial interface is used for
Monitor 51 and at which baudrate.
S1 and S2
Refer to “S1 and S2 DIP Switch“ on page 7 if a normal or banked Monitor 51
is used for debugging.
LED ON: display Monitor status on Port 1 LED’s (see below).
OFF: Monitor status is not displayed and Port 1 is not affected..
Monitor ON: use Monitor program for debugging
OFF: User EPROM as IC23. Refer to “S1 and S2 DIP Switch” on page 7 for
the User EPROM Memory Map.