23 lCD DRiVeR (lCD)
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
23-15
8.2 HSCLK Division Ratio Selection
Table 23.
lCKDV[2:0]
Division ratio
0x7–0x5
Reserved
0x4
1/512
0x3
1/256
0x2
1/128
0x1
1/64
0x0
1/32
(Default: 0x0)
No division ratio needs to be selected if OSC1 is selected as the LCD clock source.
D1
lCKSRC: lCD Clock Source Select Bit
Selects the LCD clock source.
1 (R/W): OSC1 (default)
0 (R/W): HSCLK (IOSC or OSC3)
D0
lCKen: lCD Clock enable Bit
Enables or disables the LCD clock supply to the LCD driver.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
The LCKEN default setting is 0, which stops the clock. Setting LCKEN to 1 feeds the clock selected as
above to the LCD driver. If no LCD display is required, stop the clock to reduce current consumption.
lCD Display Control Register (lCD_DCTl)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
lCD Display
Control Register
(lCD_DCTl)
0x50a0
(8 bits)
D7
SeGReV
Segment output assignment control 1 Normal
0 Reverse
1
R/W
D6
COMReV
Common output assignment control 1 Normal
0 Reverse
1
R/W
D5
DSPaR
Display memory area control
1 Area 1
0 Area 0
0
R/W
D4
DSPReV
Reverse display control
1 Normal
0 Reverse
1
R/W
D3–2 –
reserved
–
–
–
0 when being read.
D1–0 DSPC[1:0] LCD display control
DSPC[1:0]
Display
0x0 R/W
0x3
0x2
0x1
0x0
All off
All on
Normal display
Display off
D7
SeGReV: Segment Output assignment Control Bit
Inverts memory assignments for SEG pins.
1 (R/W): Normal (default)
0 (R/W): Inverted
When SEGREV is set to 1 (default), memory addresses are assigned to SEG pins in ascending order.
When SEGREV is set to 0, memory addresses are assigned to SEG pins in descending order. (See Fig-
ures 23.5.1 to 23.5.10.)
D6
COMReV: Common Output assignment Control Bit
Inverts memory assignments for COM pins.
1 (R/W): Normal (default)
0 (R/W): Inverted
When COMREV is set to 1 (default), memory bits are assigned to COM pins in ascending order. When
COMREV is set to 0, memory bits are assigned to COM pins in descending order. (See Figures 23.5.1
to 23.5.10.)
D5
DSPaR: Display Memory area Control Bit
Selects the display area.
1 (R/W): Display area 1
0 (R/W): Display area 0 (default)