The segment A, B, C, D, E, F and G are driven by PH0, PH1, PH2, PH3, PH4, PH5 and PH6,
respectively. The hex value of the segment code for common cathode LED display is shown in
the following table:
Number DP G F E D
C
B
A
Hex
Value
1
0 0 0 0 0 1 1 0
$06
2
0 1 0 1 1 0 1 1
$5B
3
0 1 0 0 1 1 1 1
$4F
4
0 1 1 0 0 1 1 0
$66
To flash the number 1234 on the 7-segment display, the following steps should be taken:
1. Output $06 to port H (ldaa #6, coma, staa pth) and the number 1 will be shown on the
7-segment.
2. Delay
250ms.
3. Output $5B to port H (ldaa #$5B, coma, staa pth) and the number 2 will be shown on
the 7-segment.
4. Delay
250ms.
5. Output $4F to port H (ldaa #$4F, coma, staa pth) and the number 3 will be shown on
the 7-segment.
6. Delay
250ms.
7. Output $66 to port H (ldaa #$66, coma, staa pth) and the number 4 will be shown on
the 7-segment.
8. Delay
250ms.
9. Go back to step 1.
4.4 Trimmer
pot
The VR1 is connected to the AN07 input of ADC port via J19, but the trace at J19 can be cut if
AN07 must be used by target circuits.
4.5 Speaker
The speaker is a 5V audio transducer and it can be driven by PT5, Output Comparator 5, or
PP5, PWM 5. The jumper on J10 is preset for the PT5 at factory and all sample programs on
the CD will drive the speaker via PT5.
After reset, the bootloader or the serial monitor will generate a chirp via the speaker. If the
jumper is not placed for the PT5, the chirp won’t happen.
4.6 Dual RS232 communication ports
Both P1 and P2 RJ11 connectors are configured as
DCE
devices and they can be directly
connected to the PC ‘s COM ports.
The P1 connector is used by SCI0 of the DG256 while the P2 is used by SC1 of the DG256.
The D-Bug12 monitor or serial monitor works with SCI0, so the P1 should be connected to a
PC’s COM port during debugging sessions. The SCI1 can be used by user’s application
programs. The receiver of the SCI1 can receive signals from many different devices, but only
one device at a time, or it will cause a signal collision. The jumper J15 ( located at solder side)
is used to connect the receiver of the SCI1 to the P2. When a solder bridge is installed on J15,
26
Содержание MiniDragon-Plus2 Trainer
Страница 1: ...MiniDragon Plus2 Trainer ForFreescaleHCS12microcontrollerfamily User sManual Revision 1 03 ...
Страница 6: ...Fig 1 1 MC9S12DG256 Memory map 6 ...
Страница 7: ...Fig 1 2 MC9S12DG256 MCU block diagram 7 ...
Страница 35: ...8 2 Interrupt vector table Fig 8 2 MC9S12DG256 Interrupt vector table 1 35 ...
Страница 36: ...Fig 8 3 MC9S12DG256 Interrupt vector table 2 36 ...
Страница 37: ...Fig 8 4 MC9S12DG256 secondary interrupt vector table 37 ...
