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參數(shù)資料
| 型號： | UPD178024GF |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 66/98頁 |
| 文件大?。?/td> | 467K |
| 代理商： | UPD178024GF |
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Data Sheet U14608EJ1V0DS00
66
μ
PD178024GC-051
7. DESCRIPTION OF LCD DRIVER IC (
μ
PD16431A) CONTROL
The
μ
PD178024GC-051 uses the
μ
PD16431A to control the LCD display.
The connection of the
μ
PD178024GC-051 to the
μ
PD16431A is illustrated below.
68
65
66
63
64
6
9
7
SCK
STB
KEYREQ
KEYREQ
LCD STB
LCD CS
LCD_DAT
LCD CLK
PD178024GC-051
μ
PD16431A
μ
11
OE
Key request
Strobe
Clock
8
DATA
Data
7.1
Key Scan
Key scan using the
μ
PD16431A is performed as follows:
(1) Detecting a pressed key
The controller judges the state of the KEYREQ pin (pin 6) of the
μ
PD16431A every 20 ms.
When the KEYREQ pin is high, it is assumed that a key is being pressed. Noise elimination (chattering
elimination) based on two consecutive matches is applied.
When noise elimination is performed correctly, the key code is read with serial reception.
Key data is received within 20 ms while a key is held down (the KEYREQ pin is high).
(2) Detecting the release of a key
When a key is released, the level of the KEYREQ pin of the
μ
PD16431A goes from high to low. The pin is
scanned every 20 ms and, if the low level is detected two times in a row, it is judged that the key has been
released.
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