HD66727 Datasheet, PDF(21/97 Page) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HD66727 Datasheet, PDF (21/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

◁

HD66727

SEGRAM has a capacity of 8 Ã 6 bits, for controlling the display of a maximum of 40 (48 in the 6-dot font

width) icons and marks. While COMS1 and COMS2 outputs are being selected, SEGRAM is read and

segments (icons and marks) are displayed by a multiplexing drive method (20 segments each during

COMS1 and COMS2 selection).

Bits in SEGRAM corresponding to segments to be displayed are directly set by the MPU, regardless of the

contents of DDRAM and CGRAM.

Tables 9 and 10 illustrate the correspondence between SEGRAM addresses and driver signals.

Table 9

Correspondence between Segment Display SEGRAM Addresses (ASEG) and Driver

Signals in the 5-Dot Font Width

ASEG Address

Segment Signals

Common

MSB

LSB D7 D6 D5 D4

Signal

1 0 0 0 * * * SEG1, SEG2, SEG3, SEG4, SEG5, COMS1

SEG21, SEG22, SEG23, SEG24, SEG25,

SEG41 SEG42 SEG43 SEG44 SEG45

1 0 0 1 * * * SEG6, SEG7, SEG8, SEG9, SEG10, COMS1

SEG26, SEG27, SEG28, SEG29, SEG30,

SEG46 SEG47 SEG48 SEG49 SEG50

1 0 1 0 * * * SEG11, SEG12, SEG13, SEG14, SEG15, COMS1

SEG31, SEG32, SEG33, SEG34, SEG35,

SEG51 SEG52 SEG53 SEG54 SEG55

1 0 1 1 * * * SEG16, SEG17, SEG18, SEG19, SEG20, COMS1

SEG36, SEG37, SEG38, SEG39, SEG40,

SEG56 SEG57 SEG58 SEG59 SEG60

1 1 0 0 * * * SEG1, SEG2, SEG3, SEG4, SEG5, COMS2

SEG21, SEG22, SEG23, SEG24, SEG25,

SEG41 SEG42 SEG43 SEG44 SEG45

1 1 0 1 * * * SEG6, SEG7, SEG8, SEG9, SEG10, COMS2

SEG26, SEG27, SEG28, SEG29, SEG30,

SEG46 SEG47 SEG48 SEG49 SEG50

1 1 1 0 * * * SEG11, SEG12, SEG13, SEG14, SEG15, COMS2

SEG31, SEG32, SEG33, SEG34, SEG35,

SEG51 SEG52 SEG53 SEG54 SEG55

1 1 1 1 * * * SEG16, SEG17, SEG18, SEG19, SEG20, COMS2

SEG36, SEG37, SEG38, SEG39, SEG40,

SEG56 SEG57 SEG58 SEG59 SEG60

Notes: 1. When the SFT pin is grounded, the SEG1 pin output is connected to the far left of the LCD

panel, and when the SFT pin is high, the SEG60 pin output is connected to the far left.

2. SEG1 to SEG20 data is identical to SEG21 to SEG40 and SEG41 to SEG60 data.

3. The lower five bits (D4 to D0) of SEGRAM data determine on or off display of each segment. A

segment is selected (turned on) when the corresponding data is 1, and is deselected (turned off)

when the corresponding data is 0. The upper three bits (D7 to D5) are invalid.

▷