ML9042-XX View Datasheet(PDF) - LAPIS Semiconductor Co., Ltd.
Part Name
Description
MFG CO.
'ML9042-XX' PDF : 58 Pages View PDF
LAPIS Semiconductor
FEDL9042-01
ML9042-xx
10) Busy Flag/Address Counter Read (Execution time: 0 s)
Instruction code:
RS1 RS0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1
0
1
BF
O6
O5
O4
O3
O2
O1
O0
The “BF” bit (DB7) of this instruction tells whether the ML9042 is busy in internal operation (BF = “1”) or not
(BF = “0”).
When the “BF” bit is “1”, the ML9042 cannot accept any other instructions. Before inputting a new instruction,
check that the “BF” bit is “0”.
When the “BF” bit is “0”, the ML9042 outputs the correct value of the address counter. The value of the
address counter is equal to the DDRAM, ABRAM or CGRAM address. Which of the DDRAM, ABRAM and
CGRAM addresses is set in the counter is determined by the preceding address setting.
When the “BF” bit is “1”, the value of the address counter is not always correct because it may have been
incremented or decremented by 1 during internal operation.
11) DDRAM/ABRAM/CGRAM Data Read
Instruction code:
RS1
1
RS0
1
R/W DB7
1
P7
DB6
P6
DB5
P5
DB4
P4
DB3
P3
DB2
P2
DB1
P1
DB0
P0
A character code (P7 to P0) is read from the DDRAM, Display-ON data (P7 to P0) from the ABRAM or a
character pattern (P7 to P0) from the CGRAM.
The DDRAM, ABRAM or CGRAM is selected at the preceding address setting.
After data is read, the address counter (ADC) is incremented or decremented as set by the Entry Mode Setting
instruction (see 3).
Note: Conditions for reading correct data
(1) The DDRAM, ABRAM or CGRAM Setting instruction is input before this data read instruction is input.
(2) When reading a character code from the DDRAM, the Cursor/Display Shift instruction (see 5) is input
before this Data Read instruction is input.
(3) When two or more consecutive RAM Data Read instructions are executed, the following read data is
correct.
Correct data is not output under conditions other than the cases (1), (2) and (3) above.
Note: The execution time of this instruction is 37 s at an oscillation frequency (OSC) of 270 kHz.
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