Nvis 5586A
Nvis Technologies Pvt. Ltd.
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Data with 8-bit in length can be sent into the character generator RAM or the display data
RAM. The address of the input data is instructed by the address counter, however, the
address of address counter is influenced by the final input address set instruction.
After data input whether the address counter add 1 or minus 1 is determined by the design of
the module. It can also be designed as location movement of the display.
Read Data Out of C.G. RAM/D.D. RAM:
Character generator RAM with 8-bit in length or the display data RAM can be read by the
CPU. The read out data address is instructed by the address counter. The address counter is
instructed by the final input address set instruction.
This instruction has to be set in C.G. RAM/D.D. RAM address, once shift cursor instruction
of the C.G. RAM/D.D. RAM data is read out, no other instruction can be read out.
The address setting instruction will read the data address into address counter.
Shift cursor command will allow the previous address setting to be used again in order to
read the D.D. RAM data. The data can be read from the C.G. RAM/D.D. RAM after the
cursor shift.
After the execution of data address counter add 1 or minus 1 will be set in the LCD modular.
After the execution of data read out, the display will not shift.
The operation of this device is similarly with the operation of IBM PC‘s DEBUG system.
For convenience, the operation instructions will be displayed when the device is being
switched on or RESET.
This device also has memory ability to preserve data for future use. There is a memory
indicator on the display once the data being kept after Reset. The system program starts from
0000:0000 after reset, in order to check the length of the RAM, there is a byte to be inverted
and returned to the original for every 4K in length, the verifying procedure will be repeated
until none of the byte can be inverted. During this period, avoid using the RESET to prevent
the data from unable to return to the original setting. The RAM address is to be displayed by
4 positions and up to FFFFH, however, 5 positions will be used if it exceeds FFFFH.
Operating Commands:
After power ON the system, it will display as follows:
After pressing <Enter>, the operating commands will be displayed:
Summary of Contents for 5586A
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