lc75712e Sanyo Semiconductor Corporation, lc75712e Datasheet - Page 12

• Manufacturer Part Number: lc75712e
• Description: Dot Matrix Vfd Display Controller/driver
• Manufacturer: Sanyo Semiconductor Corporation

5. Set AC address.....................................<Specifies the DCRAM and ADRAM addresses for AC.>
6. Intensity adjustment .............................<Adjusts the VFD intensity.>
*: Don’t care.
DA0 to DA5: DCRAM address
DA0....................LSB (least significant bit)
DA5....................MSB (most significant bit)
RA0 to RA3: ADRAM address
RA0 ....................LSB
RA3 ....................MSB
This instruction loads the 6-bit DA0 to DA5 DCRAM address and the 4-bit RA0 to RA3 ADRAM address into AC.
*: Don’t care.
DC0 to DC7: Duty cycle data (intensity adjustment data)
DC0 ....................LSB
DC7 ....................MSB
The data in the 8 bits DC0 to DC7 sets the VFD intensity to one of 240 levels. Since the value in the duty cycle
register is undefined immediately after power is applied, the display intensity is not determined at that point.
Therefore, applications must execute this instruction before turning on the display. Applications can adjust the
intensity using the duty cycle register and grid register. The duty cycle register value sets the pulse width (A) and the
grid register value sets the period (B). See Figure 3 for the grid timing chart details.
D23 D22 D21 D20 D19
D23 D22 D21 D20 D19
0
0
1
1
0
0
0
1
RA3 RA2 RA1 RA0
*
D18 D17 D16
D18 D17 D16
*
*
*
LC75710NE, 75711NE, 75712E
DC7 DC6 DC5 DC4 DC3 DC2 DC1 DC0
D15
D15
*
D14 D13 D12 D11 D10
D14 D13 D12 D11 D10
*
DA5 DA4 DA3 DA2 DA1 DA0
Code
Code
D9
D9
D8
D8
D7
D7
*
*
D6
D6
*
*
D5
D5
*
*
D4
D4
*
*
D3
D3
*
*
D2
D2
No. 4907-12/21
*
*
D1
D1
*
*
D0
D0
*
*