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2 how do i set vrm, 3 how do i set a frame period – FUJITSU MB91460 SERIES FR60 User Manual

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937

Chapter 47 LCD Controller

7.Q&A

7.2 How do I set VRM?

The following tables show the relationship between pins and the bit positions of VRAM(n). (n=0 to 19)

Table 7-1 1/2 duty cycle

Table 7-2 1/3 duty cycle

Table 7-3 1/4 duty cycle

(Non-selected waveform is output through the pins other than the above.)

Example: 1/4 duty cycle

When “1” is set to the bit6 of VRAMn, selected waveform is output through the SEG2n+1 of COM2.

If a bit is set to “0”, non-selected waveform is output through the corresponding pin.

7.3 How do I set a frame period?

Use the frame period generation clock select bit (LCR0.CSS) and the frame period bit (LCR0.FP[1:0]). The
following settings are available:

N (Time division number) = MS[1:0] value + “1”

Set an appropriate frame period that corresponds to the frame frequency of your LCD panel.

Pin

COM1

COM0

SEG 2n

bit 1

bit 0

SEG 2n+1

Bit 5

Bit 4

pin

COM2

COM1

COM0

SEG 2n

bit 2

bit 1

bit 0

SEG 2n+1

Bit 6

Bit 5

Bit 4

pin

COM3

COM2

COM1

COM0

SEG 2n

bit 3

bit 2

bit 1

bit 0

SEG 2n+1

bit 7

Bit 6

Bit 5

Bit 4

Frame period

Selected value

Frame period generation clock

select bit (CSS)

Frame period bit

(FP[1:0])

Peripheral clock (F

CLKP

)/(2

13

× N)

Set to “0”.

Set to “00”.

Peripheral clock (F

CLKP

)/(2

14

× N)

Set to “0”.

Set to “01”.

Peripheral clock (F

CLKP

)/(2

15

× N)

Set to “0”.

Set to “10”.

Peripheral clock (F

CLKP

)/(2

16

× N)

Set to “0”.

Set to “11”.

Subclock (F

CL-SUB

)/(2

3

× N)

Set to “1”.

Set to “00”.

Subclock (F

CL-SUB

)/(2

4

× N)

Set to “1”.

Set to “01”.

Subclock (F

CL-SUB

)/(2

5

× N)

Set to “1”.

Set to “10”.

Subclock (F

CL-SUB

)/(2

6

× N)

Set to “1”.

Set to “11”.