Difference between revisions of "Universal 4x4 keypad"
From ScienceZero
(→Keypads) |
(→Pin assignment) |
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==Pin assignment== | ==Pin assignment== | ||
| − | *RB0-3 = Keyboard output/Parallel data output | + | *RB0-3 = Keyboard row output/Parallel data output |
| − | *RB4-7 = Keyboard input | + | *RB4-7 = Keyboard column input |
*RA0 = DATA (RS-232, SPI, MIDI) | *RA0 = DATA (RS-232, SPI, MIDI) | ||
*RA1 = CLOCK (SPI) | *RA1 = CLOCK (SPI) | ||
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*RA3 = BEEPER/LED | *RA3 = BEEPER/LED | ||
*RA4 = Free | *RA4 = Free | ||
| − | |||
==Connection diagram for keypad== | ==Connection diagram for keypad== | ||
Revision as of 12:23, 11 March 2009
Contents
Keypads
3 predefined keypads and one user definable keypad. Selectable binary, ASCII or key number.
Telephone keypad
1 2 3 A 4 5 6 B 7 8 9 C * 0 # D
Calculator keypad
7 8 9 + 4 5 6 - 1 2 3 * 0 . E /
User defined keypad
7 8 9 / 4 5 6 * 1 2 3 - C 0 = +
Interface
- RS-232
- 16 to 43 478 Baud
- SPI
- 83 kHz with enable
- Parallel
- 4 bit parallel output of key number
- MIDI
Misc
- Selectable beep/LED
Pin assignment
- RB0-3 = Keyboard row output/Parallel data output
- RB4-7 = Keyboard column input
- RA0 = DATA (RS-232, SPI, MIDI)
- RA1 = CLOCK (SPI)
- RA2 = ENABLE (SPI, Parallel)
- RA3 = BEEPER/LED
- RA4 = Free
Connection diagram for keypad
If the keypad is 3 keys wide; leave RB7 disconnected.
RB0---X---X---X---X--
| | | |
RB1---X---X---X---X--
| | | |
RB2---X---X---X---X--
| | | |
RB3---X---X---X---X--
| | | |
RB4 RB5 RB6 RB7
