HD66108 Datasheet, PDF (44/60 Pages) Hitachi Semiconductor – (RAM-Provided 165-Channel LCD Driver for Liquid Crystal Dot Matrix Graphics)

HD66108
Internal Registers
All HD66108T’s registers can be read from and written into. However, the BUSY FLAG and invalid bits
cannot be written to and reading invalid bits or registers returns 0’s.
1. Address Register (AR) (Accessed with RS = 0)
This register (Figure 27) contains Register No. bits, BUSY FLAG bit, STBY bit, and DISP bit. Register
No. bits select one of the data registers according to the register number written. The BUSY FLAG bit
indicates the internal operation state if read. The STBY bit activates the standby function. The DISP bit
turns the display on or off. This register is selected when RS pin is 0.
Bits D4 and D3 are invalid.
D7
BUSY
FLAG
D6
STBY
D5
DISP
D4
D3
—
D2
D1
D0
Register No.
(1) STBY
1: Standby function on
0: Normal (standby function off)
Note: When standby function is on, all registers are reset to 0’s.
(2) DISP
1: LCD on
0: LCD off
(3) Register No.
Bit
No. 2 1 0
0 000
1 001
2 010
3 011
4 100
5 101
Register
Display memory
X address register
Y address register
Control register
Mode register
C select register
(4) BUSY FLAG (can be read only)
1: Busy state
0: Ready state
Figure 27 Address Register
997