19 UNIVERSAL SERIAL INTERFACE WITH LCD INTERFACE (USIL)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
19-49
USIL LCD Parallel I/F Mode Interrupt Flag Register (USIL_LPIF)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
USIL LCD
Parallel I/F
Mode Interrupt
Flag Register
(USIL_LPIF)
0x300692
(8 bits)
D7–3 –
reserved
–
–
–
X when being read.
D2
LPBSY
Transfer busy flag
1 Busy
0 Idle
0
R
D1
LPRDIF
Read buffer full flag
1 Full
0 Not full
0
R/W Reset by writing 1.
D0
LPWRIF
Write buffer empty flag
1 Empty
0 Not empty
0
R/W
Note: This register is effective only in LCD parallel mode. Configure USIL to LCD parallel mode before
setting this register.
D[7:3]
Reserved
D2
LPBSY: Transfer Busy Flag Bit
Indicates the LCD parallel interface status.
1 (R):
Busy
0 (R):
Idle (default)
LPBSY is set to 1 when the LCD parallel interface starts data transfer and is maintained at 1 while
transfer is underway. It is cleared to 0 once the transfer is completed.
D1
LPRDIF: Read Buffer Full Flag Bit
Indicates the read (receive data) buffer status.
1 (R):
Data full
0 (R):
No data (default)
1 (W):
Reset to 0
0 (W):
Ignored
LPRDIF is set to 1 when data received is loaded to the read buffer (when receiving is completed), indi-
cating that the data can be read. At the same time a read buffer full interrupt request is sent to the ITC if
LPRDIE/USIL_LPIE register is 1. LPRDIF is reset by writing 1.
D0
LPWRIF: Write Buffer Empty Flag Bit
Indicates the write (transmit data) buffer status.
1 (R):
Empty
0 (R):
Data exists (default)
1 (W):
Reset to 0
0 (W):
Ignored
LPWRIF is set to 1 when the data written to the write buffer is output via the LCD_D[7:0] pins,
indicating that the next data can be written to. At the same time a write buffer empty interrupt request is
sent to the ITC if LPWRIE/USIL_LPIE register is 1. LPWRIF is reset by writing 1.
USIL LCD Parallel I/F Mode Access Timing Register (USIL_LPAC)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
USIL LCD
Parallel I/F
Mode Access
Timing Register
(USIL_LPAC)
0x30069f
(8 bits)
D7–6 LPHD[1:0] Hold cycle
LPHD[1:0]
Hold cycle
0x0 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D5–4 LPST[1:0]
Setup cycle
LPST[1:0]
Setup cycle
0x0 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D3–0 LPWT[3:0] Wait cycle
LPWT[3:0]
Wait cycle
0x0 R/W
0xf
0xe
:
0x1
0x0
15 cycles
14 cycles
:
1 cycle
0 cycles
Note: This register is effective only in LCD parallel mode. Configure USIL to LCD parallel mode before
setting this register.