Motorola 68HC12BC32 ユーザーズマニュアル
11
PORTS AND CONNECTORS
LCD_PORT
The LCD_PORT interface is connected to the data bus and memory mapped to locations 270
– 27F hex assigned to CS7. For the standard display, address 270 is the Command register,
address 271 is the Data register.
– 27F hex assigned to CS7. For the standard display, address 270 is the Command register,
address 271 is the Data register.
The interface supports all OPTREX
DMC series displays in 8 bit bus mode with up to 80
characters and provides the most common pinout for a dual row rear mounted display
connector. Power, ground, and Vee are also available at the LCDPORT-1 connector.
connector. Power, ground, and Vee are also available at the LCDPORT-1 connector.
+5V
2
1
GND
A0
4
3
LCD-Vee
LCD1
6
5
/RW
D9
8
7
D8
D11 10
9
D10
D13 12 11 D12
D15 14 13 D14
D15 14 13 D14
Command Register:$270
Data Register:
Data Register:
$271
LCD-Vee is supplied by U13 and is adjusted by the R18
Potentiometer (adjustable resistor).
Potentiometer (adjustable resistor).
See the file KEYLCD12.ASM for an example program using this
LCD connector.
LCD connector.
LCD3 2
1
LCD2
4
3
LCD4
Additional lines can be used as enables for larger panels and
are mapped as:
are mapped as:
LCD2 = $274 & $275
LCD4 = $27C & $27D
LCD3 = $278 & $279
KEYPAD
1
PS4
2
PS5
3
PS6
4
PS7
5
PP4
6
PP5
7
PP6
8
PP7
The KEYPAD connector is a passive 8-pin connector that can be used to
connect a 4 x 4 matrix (16 key) keypad device. The connector is mapped to
the HC12 I/O ports S and P. This interface is implemented as a software
keyscan. Pins PS4-7 are used as column drivers which are active low
outputs. Pins PP4-7 are used for row input and provide an idle hi condition
with internal pull-ups to provide active key detection under software control.
connect a 4 x 4 matrix (16 key) keypad device. The connector is mapped to
the HC12 I/O ports S and P. This interface is implemented as a software
keyscan. Pins PS4-7 are used as column drivers which are active low
outputs. Pins PP4-7 are used for row input and provide an idle hi condition
with internal pull-ups to provide active key detection under software control.
See the HC12 Technical Reference Manual for a full description of these pins and the file
KEYLCD12.ASM
KEYLCD12.ASM
for an example program using this connector.