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參數(shù)資料
| 型號： | SC83053 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | KEYBOARD ENCODER |
| 中文描述： | 鍵盤編碼器 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大小： | 483K |
| 代理商： | SC83053 |
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Silan
Semiconductors
SC83053
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2001.11.8.
5
FUNCTION DESCRIPTION
Keyboard buffer
The keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to receive scan codes from
the keyboard. The response codes and repeated codes will not be buffered. If keystrokes generate a multiple-
byte sequence, the entire sequence must fit into the buffer or the keystroke is discarded and a buffer-overrun
condition occurs.
Power-on Reset and self test
The duration of the keyboard Power-on-Reset(POR) should be within 150 milliseconds and 2 seconds after the
power is applied to the keyboard.
After executing POR , the keyboard executes a self test. The LEDs are turned on at the beginning and off at
the end of the self test. The self test takes a minimum 300 milliseconds and a maximum 500 milliseconds. If the
self test is successful, a completion code AA hex is sent to the system and the keyboard starts scanning. If the
self test fails, and error code is sent, the keyboard is disabled and waits for a command from the system. The
completion codes are sent between 450 milliseconds and 2.5 seconds after POR, and between 300 and 500
milliseconds after a RESET command is acknowledged.
Keyboard data output
When the keyboard is ready to send data to the system, it first checks clock and data lines. If either one is in
the low state, data is stored in the keyboard buffer. If both are in the high state, keyboard starts clocking data out.
Data will be valid before the trailing edge and after the leading edge of the clock pulse. During the transmission
the keyboard checks the clock line at least every 60 microseconds . If the system lowers the clock lines before
the leading edge of the 10th clock, the keyboard should stop sending, then buffer the data and return clock and
data lines to high state.
Keyboard data input
When the system is ready to send data to the keyboard, it first checks clock line to see if keyboard is sending
data. If keyboard is not sending data or it is sending data but has not reached the 10th clock, the system can
inhibit the interface by forcing the clock line low for more than 60 microseconds and prepares to send data. The
keyboard checks clock line status at least every 5 milliseconds. If a system Request to Send (RTS) is detected,
the keyboard clocks 11 bits in. After the 10th bit, the keyboard checks for a high state in data line then pulls it low
and clocks one more bit to signal the system that data has been received. If data is low after the 10th bit, it
indicates a frame error. The keyboard should continue to count until data line goes high, then pulls it low and
issues a RESEND to the system
.
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