參數(shù)資料
型號: HD66728
廠商: Hitachi,Ltd.
英文描述: 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
中文描述: 112 × 80點圖形LCD控制器/驅(qū)動器(112 × 80點圖形液晶顯示控制器)
文件頁數(shù): 66/138頁
文件大小: 2158K
代理商: HD66728
HD66728
66
The key-scanned data can be read by an MPU via a serial interface. First, a start byte should be transferred.
After the HD66728 has received the start byte, the MPU reads scan data KSD7 to KSD0 from the SCAN0
register starting from the MSB. Similarly, the MPU reads data from SCAN1, SCAN2 and SCAN3 in that
order. After reading SCAN3, the MPU starts at SCAN0 again.
The HD66728 may be read out while it is latching scan data and is thus unstable. Consequently, it should
also be reconfirmed with software if required.
b) Consecutive Scan Data Read Timing
a) Scan Data Read Timing through Clock-synchronized Serial Bus Interface
Wait
Start
byte
SCL
(Input)
SDA
(Input/
output)
SCAN0
data
SCAN1
data
SCAN2
data
SCAN3
data
Wait
Wait
SCAN0
data
Wait
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Start byte
Device ID code
SCL
(Input)
SDA
(Input/
output)
CS*
(Input)
SCAN0 data transmission
R/W
RS
Transfer start
Transfer end
ID
0
1
1
1
0
KSD7 KSD6KSD5 KSD4KSD3 KSD2 KSD1KSD0
0
1
Figure 33 Scan Data Serial Transfer Timing
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