23 lCD DRiVeR (lCD)
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
23-17
lCD Clock Control Register (lCD_CCTl)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
lCD Clock
Control Register
(lCD_CCTl)
0x50a2
(8 bits)
D7–6 FRMCnT[1:0] Frame frequency control
FRMCNT[1:0] Division ratio
0x1 R/W Source clock: LCLK
0x3
0x2
0x1
0x0
1/1024
1/680
1/512
1/256
D5
lFROuT
LFRO output control
1 On
0 Off
0
R/W
D4–3 –
reserved
–
–
–
0 when being read.
D2–0 lDuTY[2:0] LCD duty select
LDUTY[2:0]
Duty
0x4 R/W
0x7–0x5
0x4
0x3
0x2
0x1
0x0
reserved
1/8
1/4
1/3
1/2
Static
D[7:6]
FRMCnT[1:0]: Frame Frequency Control Bits
Sets the Frame frequency.
When the clock source is OSC1
8.5 Frame Frequency Settings (when OSC1 = 32.768 kHz)
Table 23.
Drive duty
(lDuTY[2:0] setting)
FRMCnT[1:0] setting (lClK division ratio)
0x0
0x1
0x2
0x3
1/8 duty (0x4)
128 Hz (1/256)
64 Hz (1/512)
*
48.19 Hz (1/680)
32 Hz (1/1024)
1/4 duty (0x3)
128 Hz (1/256)
64 Hz (1/512)
48.19 Hz (1/680)
32 Hz (1/1024)
1/3 duty (0x2)
130.04 Hz (1/252)
65.02 Hz (1/504)
48.12 Hz (1/681)
32.5 Hz (1/1008)
1/2 duty (0x1)
128 Hz (1/256)
64 Hz (1/512)
48.19 Hz (1/680)
32 Hz (1/1024)
Static (0x0)
128 Hz (1/256)
64 Hz (1/512)
48.19 Hz (1/680)
32 Hz (1/1024)
*
Default setting
When the clock source is HSCLK
8.6 Frame Frequency Settings
Table 23.
Drive duty
(lDuTY[2:0] setting)
FRMCnT[1:0] setting
0x0
0x1
0x2
0x3
1/8 duty (0x4)
f
HSCLK
×
LCKDV
––––––––––––––
256
f
HSCLK
×
LCKDV
*
––––––––––––––
512
f
HSCLK
×
LCKDV
––––––––––––––
680
f
HSCLK
×
LCKDV
––––––––––––––
1024
1/4 duty (0x3)
f
HSCLK
×
LCKDV
––––––––––––––
256
f
HSCLK
×
LCKDV
––––––––––––––
512
f
HSCLK
×
LCKDV
––––––––––––––
680
f
HSCLK
×
LCKDV
––––––––––––––
1024
1/3 duty (0x2)
f
HSCLK
×
LCKDV
––––––––––––––
252
f
HSCLK
×
LCKDV
––––––––––––––
504
f
HSCLK
×
LCKDV
––––––––––––––
681
f
HSCLK
×
LCKDV
––––––––––––––
1008
1/2 duty (0x1)
f
HSCLK
×
LCKDV
––––––––––––––
256
f
HSCLK
×
LCKDV
––––––––––––––
512
f
HSCLK
×
LCKDV
––––––––––––––
680
f
HSCLK
×
LCKDV
––––––––––––––
1024
Static (0x0)
f
HSCLK
×
LCKDV
––––––––––––––
256
f
HSCLK
×
LCKDV
––––––––––––––
512
f
HSCLK
×
LCKDV
––––––––––––––
680
f
HSCLK
×
LCKDV
––––––––––––––
1024
*
Default setting
f
HSCLK
: HSCLK (IOSC or OSC3) clock frequency, LCKDV: HSCLK division ratio (1/32 to 1/512)
D5
lFROuT: lFRO Output Control Bit
Controls the frame signal (LFRO) output.
1 (R/W): Output enabled (On)
0 (R/W): Output disabled (Off) (default)
Setting LFROUT 1 outputs the frame signal generated by the LCD module from the LFRO pin. Setting
it to 0 stops output and the LFRO pin goes a low level.
D[4:3]
Reserved
D[2:0]
lDuTY[2:0]: lCD Duty Select Bits
Selects the drive duty.