26 LCD CONTROLLER (LCDC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
26-37
Note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
LCDC Interrupt Enable Register (LCDC_INT)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
LCDC Interrupt
Enable Register
(LCDC_INT)
0x302000
(32 bits)
D31–1 –
reserved
–
–
–
0 when being read.
D0
FRINTEN
Frame interrupt enable
1 Enable
0 Disable
0
R/W
D[31:1] Reserved
D0
FRINTEN: Frame Interrupt Enable Bit
Enables or disables LCDC frame interrupts.
1 (R/W): Enabled
0 (R/W): Disabled (default)
When using the frame interrupt, set FRINTEN to 1. The frame interrupt requests to the ITC is enabled.
When this bit is set to 0, the frame interrupt will not be generated.
Status and Power Save Configuration Register (LCDC_PSAVE)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
Status and
Power Save
Configuration
Register
(LCDC_PSAVE)
0x302004
(32 bits)
D31
FRINTF
Frame interrupt flag
1 Occurred
0 Not occurred
0
R/W Reset by writing 1.
D30–8 –
reserved
–
–
–
0 when being read.
D7
VNDPF
Vertical display status flag
1 VNDP
0 VDP
1
R
D6–2 –
reserved
–
–
–
0 when being read.
D1–0 PSAVE[1:0] Power save mode select
PSAVE[1:0]
Mode
0x0 R/W
0x3
0x2
0x1
0x0
Normal
reserved
reserved
Power save
D31
FRINTF: Frame Interrupt Flag Bit
Indicates the frame interrupt cause occurrence status.
1 (R):
Cause of interrupt has occurred
0 (R):
No cause of interrupt has occurred (default)
1 (W):
Flag is reset
0 (W):
Ignored
FRINTF is set to 1 when a vertical non-display period begins. If FRINTEN/LCDC_INT register has
been set to 1, a frame interrupt request is sent to the ITC at the same time.
D[30:8] Reserved
D7
VNDPF: Vertical Display Status Flag Bit
Indicates whether the LCD panel is in a vertical non-display period or not.
1 (R):
Vertical non-display period (default)
0 (R):
Vertical display period
VNDPF is set to 1 during a vertical non-display period, and set to 0 during a vertical display period.
When images must be switched without causing the screen to flicker, it is possible to switch within a
vertical non-display period by reading this bit.
D[6:2]
Reserved
D[1:0]
PSAVE[1:0]: Power Save Mode Select Bits
Selects the power-save mode.
10.2 Power-Save Mode Settings
Table 26.
PSAVE[1:0]
Mode
0x3
Normal operation
0x2
Reserved
0x1
Reserved
0x0
Power-save mode
(Default: 0x0)