29 MISC REGISTERS (MISC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
29-5
Boot Register (MISC_BOOT)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
BOOT Register
(MISC_BOOT)
0x300016
(8 bits)
D7–4 BOOT[3:0] Boot mode indicator
BOOT[3:0]
Boot mode
*
R
*
Depends on the
BOOT pin status at
initial reset
0b1000
0b0100
Other
SPI/RS232C
NOR/ROM
reserved
D3–2 –
reserved
–
–
–
0 when being read.
D1
BOOT_ENA #CE10 area boot enable
1 Internal
0 External
1
R/W Write-protected
D0
–
reserved
–
–
–
0 when being read.
D[7:4]
BOOT[3:0]: Boot Mode Indicator Bits
Indicates the boot device that has been specified by the BOOT pin.
6.6 BOOT[3:0] Bits
Table 29.
BOOT[3:0]
Boot mode
0b1000
SPI/RS232C boot
0b0100
NOR Flash/external ROM boot
Other
Reserved
BOOT[3:0] is set by the system boot sequencer. Do not alter these bit values from the user routine.
D[3:2]
Reserved
D1
BOOT_ENA: #CE10 Area Boot Enable Bit
Enables fetching the RESET vector from the #CE10 external area (0xc00000).
1 (R/W): Internal boot (default)
0 (R/W): External boot
BOOT_ENA is set by the system boot sequencer. When programming a Flash memory using ICD33,
BOOT_ENA must be set to 0.
D0
Reserved
RAM Location Select Register (MISC_RAM_LOC)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
RAM Location
Select Register
(MISC_RAM_
LOC)
0x300018
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4
DSTRAM_
CFG
DSTRAM configuration
1 LUTRAM
0 DSTRAM
0
R/W Write-protected
D3–1 –
reserved
–
–
–
0 when being read.
D0
IVRAM_LOC IVRAM location select
1 Area 3
0 Area 0
1
R/W Write-protected
D[7:5]
Reserved
D4
DSTRAM_CFG: DSTRAM Configuration Bit
Selects whether DSTRAM in Area 3 is used as DSTRAM or LUTRAM.
1 (R/W): LUTRAM
0 (R/W): DSTRAM (default)
By default (DSTRAM_CFG = 0), DSTRAM is located in Area 3 and is used as a general-purpose RAM
or DMA control table memory.
Setting DSTRAM_CFG to 1 configures DSTRAM to LUTRAM to be used as the color look-up tables
for the LCDC. When using the color look-up tables, set DSTRAM_CFG to 1 and LUTPASS/LCDC_
DISPMOD register to 0. For more information on the color look-up tables, see the “LCD Controller
(LCDC)” chapter.
Note: When DSTRAM is switched to LUTRAM, locate the DMAC control table in IVRAM (Area 3) or
an external RAM.
D[3:1]
Reserved
D0
IVRAM_LOC: IVRAM Location Select Bit
Selects the 20KB IVRAM location.
1 (R/W): Area 3 (default)
0 (R/W): Area 0