st2608b Sitronix Technology Corporation, st2608b Datasheet - Page 24

• Manufacturer Part Number: st2608b
• Description: 8-bit Integrated Microcontroller
• Manufacturer: Sitronix Technology Corporation

<LCDCK=32k clock source on ST2602B/ST2608B display>
(1) Control register
(2)
(3) Sysclk is RC:
1.
2.
3.
4.
(4) Sysclk is 32K:
1.
2.
3.
4.
5.
(5) change Sysclk from RC to 32K
Step1: let LCD in fast B/W mode
Step2: use the macro “SWITCH_SYSCLK_RC_TO_32K” to change Sysclk to 32K
Frame
Frame
Address Name
Address Name
$047
$048
Lcd clock source is Sysclk. If Sysclk is RC, LCD clock source will be RC.
In ST2602B, if LCD clock source is RC, B/W, 4G, 16G mode are the same as ST2602.
The fast B/W mode is added. In fast B/W mode, the LCDCK will be divided by 8.
IF Sysclk is RC and in fast B/W mode, the frame rate is determined as below.
If Sysclk is 32k, LCD clock source will be 32k.
If Sysclk is 32k, LCD can only display B/W.
If LCD clock source is 32k, please set GL[3:2]=11(fash B/W mode) . In this condition, LCKR and LPAN control registers
will avoid. LCDCK is always 32k hz and the frame rate is only controlled by LFRA control register.
If LCD clock source is 32k, DC-DC converter clock (LPCK) will also become 32k. So, user must to change LPCK register
to get higher pump frequency(We will provide a macro to take care this part).
IF Sysclk is 32K and in fast B/W mode, the frame rate is determined by below equation.
Bit 3~2: GL[3:2] : LCD gray-level selection bit
Bit [5:4]: LMOD : LCD data bus mode selection
Bit 3~0: LCKR[3:0] : LCD clock selection (when SYSCK=OSCK)
Rate
Rate
LCTR
LCKR
00 = B/W.
01 = 4 gray
10 = 16gray
11 = fast B/W mode
00 = 1-bit mode
01 = 4-bit mode
1X = 8-bit mode
LCKR[3:0]
=
=
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
1011
1100
1101
1110
1111
(
(
LXMAX
LXMAX
R/W
R/W
R/W
W
(LMOD=00)
1-bit mode
LPWR
+
+
Bit 7
Bit 7
LFRA
LFRA
LCDCK (B/W, 4G, 16G mode)
-
LCDCK
LCDCK
+
+
BLNK
Bit 6
(LMOD=01)
) 1
) 1
SYSCK /10
SYSCK /12
SYSCK /14
SYSCK /16
SYSCK /18
SYSCK /20
SYSCK /22
SYSCK /24
SYSCK /26
SYSCK /28
SYSCK /30
Bit 6
4-bit mode
SYSCK /6
SYSCK /4
SYSCK /8
SYSCK/2
SYSCK
-
×
×
(
(
LYMAX
LYMAX
LMOD[1] LMOD[0] LCK[3]
Bit 5
REV
Bit 5
(LMOD=1X)
8-bit mode
*
*
) 2
) 2
24/34
Bit 4
, where LCDCK is 32K hz.
Bit 4
CAS
(LMOD=00)
1-bit mode
Bit 3
GL[3]
Bit 3
LCDCK (fast B/W mode)
LCK[2]
Bit 2
GL[2]
Bit 2
SYSCK /112
SYSCK /128
SYSCK /144
SYSCK /160
SYSCK /176
SYSCK /192
SYSCK /208
SYSCK /224
SYSCK /240
(LMOD=01)
SYSCK /32
SYSCK /48
SYSCK /64
SYSCK /80
SYSCK /96
SYSCK/16
4-bit mode
SYSCK/8
LCK[1]
Bit 1
GL[1]
Bit 1
(LMOD=1X)
8-bit mode
LCK[0]
Bit 0
GL[0]
Bit 0
- - 00 0000
Default
1000 0000
Default
ST2608B