Epson S1C17624 Technical Manual page 258

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
lCD Display 0x50a0
D7
Control Register
(8 bits)
D6
(lCD_DCTl)
D5
D4
D3–2 –
D1–0 DSPC[1:0]
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)
S1C17624/604/622/602/621 TeChniCal Manual
Table 23. 8.2 HSCLK Division Ratio Selection
lCKDV[2:0]
0x7–0x5
0x4
0x3
0x2
0x1
0x0
name Function
SeGReV
Segment output assignment control 1 Normal
COMReV
Common output assignment control 1 Normal
DSPaR Display memory area control
DSPReV
Reverse display control
reserved
LCD display control
Seiko epson Corporation
Division ratio
Reserved
1/512
1/256
1/128
1/64
1/32
(Default: 0x0)
Setting init. R/W
0 Reverse
0 Reverse
1 Area 1 0 Area 0
1 Normal 0 Reverse
–
DSPC[1:0] Display 0x0 R/W
0x3 All off
0x2 All on
0x1 Normal display
0x0 Display off
23 lCD DRiVeR (lCD)
Remarks
1 R/W
1 R/W
0 R/W
1 R/W
– – 0 when being read.
23-15