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參數(shù)資料
| 型號(hào)： | MSC7170-01 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 5x7 Dot Character x 16-Digit x 2-Line Display Controller/Driver with Keyscan Function |
| 中文描述： | 5x7點(diǎn)字符× 16位× 2行顯示控制器/驅(qū)動(dòng)器與鍵盤掃描功能 |
| 文件頁數(shù)： | 16/27頁 |
| 文件大小： | 253K |
| 代理商： | MSC7170-01 |
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Semiconductor
MSC7170-01
16/27
FEDL7170-03
Key switch data is latched internally for transfer to the microprocessor via the SPI port. The
microprocessor may use
KBINT
as an interrupt request or for polling the MSC7170-01 to
determine when new keyscan information is available. As an alternative for polling, the
MSC7170-01 continuously outputs a status byte during any SPI transaction, with the exceptions
of the Null Command and the Keyscan Data Output Command. An all zeros (00h) byte indicates
the presence of new keyscan information while all ones (FFh) indicate no new keyscan
information. For the Null and Keyscan Data Output commands, the first byte output is still the
status byte followed by five bytes containing the data from the five keyscan rows as described
above and in the Output Data Bytes section. The status byte is reset upon completion of a Keyscan
Data Output command in the same fashion as
KBINT
.
The MSC7170-01 can also be commanded into a low power or "standby" mode (see Mode Set
command). In this mode all operation, including the internal oscillator, of the MSC7170-01
ceases. The only exception is the key scan detection circuitry which, on any key pad activity
(depress or release), will cause the MSC7170-01 to return to normal operation. The MSC7170-
01 will be fully operational within 10 msec (max) after return to normal operation. The wake-up
cycle includes a full scan of the key matrix.
KBINT
will be pulled low to indicate full wake-up.
Normal operation is also resumed when the
ENABLE
line is taken low. In this case, a scan of the
key matrix is not executed, nor is the
KBINT
line pulled low to indicate full wake-up.
The RESET and
ENABLE
lines shall be maintained at logic high levels during standby operation.
All segment outputs go to a high impedance state while in standby mode. The SPI interface lines
(SLCK, SIMO, and SOMI) will not interfere with the operation of the SPI network when the
standby mode is properly selected. To ensure correct operation of the SPI network, the standby
mode of the MSC7170-01 should always be selected before the logic supply is switched off.
The following sequence of events should be followed to enter standby mode:
1)
2)
3)
Set duty cycle to zero percent
Turn off high voltage (V
DISP
)
Send low power (standby) "on" command
Following wake-up, the high voltage should be turned on prior to setting a duty cycle greater
than zero percent.
The MSC7170-01 may be commanded into Blank and Lamp Test modes. For Blank mode,
the DUTY and SEGn-1 to SEGn-35 outputs remain at a continuous low level while the SEGn36
outputs assume a high level. The outputs remain at this level until the command is deselected.
For Lamp Test mode, the DUTY output assumes a maximum duty cycle condition and the SEGn
outputs are all forced to the on condition regardless of input data.
The MSC7170-01 accepts a reset signal from the microprocessor or other controller. There shall
be no internal pull-up resistor on this signal. The state of the MSC7170-01 following a reset is as
follows:
a)
b)
c)
d)
e)
f)
All segment driver outputs are low
The number of display digits is 16
￥
2.
The display duty cycle is set to 0
Display Data Buffers are not cleared
SPI registers are reset
Keyscan registers are reset
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