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5.2 Interfacing to the MPU
This VFD module can interface in 8-bit operation.
5.3 Power-on reset
An internal reset circuit automatically initializes the module when the power is turned on.
The following instructions are executed during the initialization.
1) Display clear
Fill the DD-RAM with 20H(Space Code)
2) Set the address counter to 00H
Set the address counter (ACC) to point DD-RAM.
3) Display on/off control:
D = 0 : Display off
B = 0 : Blinking off
4) Entry mode set:
I/D = 1 : Increment by 1
S =0 : No shift
5) Function Set
IF = 1 : 8-bit interface data
N = 1 : 2-line display
BR0 = BR1 = 0 ; Brightness = 100
6. INSTRUCTIONS
6.1 Outline
Only the instruction register (IR) and the data register (DR) of the VFD controller can be controlled by
the user’s MPU. Before starting the internal operation of the controller, control information is temporarily
stored into these registers to allow interfacing with various MPUs, which operate at different speeds, or
various peripheral control devices. The internal operation of the controller is determined by signals sent
from the MPU. These signals, which include register selection signal (RS), write signal (/WR) and the
data bus (DB0 to DB7), make up the controller instructions (See Table_13).
These are four categories of instructions that:
.Designate controller functions, such as display format, data length, etc.
.Set internal RAM addresses
.Perform data transfer with internal RAM
.Perform miscellaneous functions
Normally, instructions that perform data transfer with internal RAM are used the most.
However, auto-incrementation by 1 ( or auto-decrementation by 1) of internal RAM addresses after each
data write can lighten the program load of the MPU. Since the display
shift instruction can perform
concurrently with display data write, the user can minimize system development time with maximum
programming efficiency.
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相关PDF资料
M0216MD-162MDBR2-J
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