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| 型號： | LC868910 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 88K |
| 代理商： | LC868910 |
LC868900/10/50/60
No.6709-16/20
The correct data cannot be read in the first read operation. The specified value is output in the second read
operation. Accordingly, a dummy read operation must be performed once when reading data after setting
the cursor address.
11. Read Busy flag
REGISTER R / W
Instruction
Busy
RS
1
1
DB7
0
1 / 0
DB6
0
DB5
0
DB4
0
DB3
1
DB2
1
DB1 DB0
1
0
1
1
no meaning
The Busy flag is output to DB7 when read mode is extablished with RS=1. The Busy flag is set to 1 while
any of the instructions (1) through (10) is being executed. It is set to 0 at the completion of the execution,
allowing the next instruction to be accepted. No other instruction can be accepted when the Busy flag is 1.
Accordingly, before writing an instruction and data, it is necessary to ensure that the Busy flag is 0.
However, the next instruction can be executed without checking the Busy flag when the maximum read
cycle time or the write cycle time has been exceeded after execution of the previous data read instruction or
the data write instruction.
The Busy flag does not change when data is written into the instruction register (RS=1).
This flag is set when data is written into the data register (RS=0). Therefore, the Busy flag need not be
checked immediately after writing data into the instruction register. Specification of the instruction register
is unnecessary to read the Busy flag.
00H
10H
20H
30H
7F0H
01H
11H
21H
31H
7F1H
02H
12H
22H
32H
7F2H
03H
13H
23H
33H
7F3H
04H
14H
24H
34H
7F4H
RAM Address
ex.) Writing (reading) data to display RAM
Lower cursor address (CAL) = 03H
Upper cursor address (CAH) = 02H
Display number (Dn) = 05H
Internal RAM size = 1280 bytes
If writing operation is executed when the CAL counter is '0',
the CAH counter is decremented by 1 after writing operation.
The CAL counter is set to (Dp -1).
Specification by the cursor address
First of all, data is written this RAM
address.
Decrement by 1 after writing operation.
If writing operation is executed when the cursor address is '00H', the address specified
by the internal RAM size is set to the CAH counter after writing operation.
Internal RAM size 1280 bytes --> 7FH
Internal RAM size 640 bytes --> 3FH
The CAL counter is set to (Dp -1).
ILC00239
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