19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 821 of 1658
REJ09B0261-0100
Pin Name
Number I/O
Function
Signal Name Used
in This Section
DG5
1
Output Digital green 5
DB0
1
Output Digital blue 0
DB1
1
Output Digital blue 1
DB2
1
Output Digital blue 2
DB3
1
Output Digital blue 3
DB4
1
Output Digital blue 4
DB5
1
Output Digital blue 5
Note: In this section, unless otherwise noted, "dot clock" refers to the output dot clock.
19.3
Register Descriptions
Register update methods include external update and internal update.
(1)
External Update
An "external update" is an update which reflects the address-mapped register settings made by the
CPU after the end of CPU access. Registers related to display control (for example, the display
system control register) and the settings of which are updated through external updates can be
overwritten during the vertical blanking interval without display flicker by using the VBK flag and
FRM flag in the display status register (DSSR) indicating the start position of the vertical blanking
interval.
(2)
Internal Update
An "internal update" is an update which reflects the address-mapped register settings with the
internal update timing of the display unit (DU). Hence in the case of a register with an internal
update function, even when the CPU overwrites address-mapped registers related to display
operation without being aware of the display timing, display flicker can be prevented.
An internal update is performed during the interval in which the DRES bit in the display system
control register (DSYSR) is 1 and at the beginning of each frame. The internal update performed
at the beginning of each frame can be disabled using the IUPD bit in DSYSR.
Internal updates are performed on the following bits by setting to 1 the DRES bit in DSYSR:
Summary of Contents for SH7781
Page 4: ...Rev 1 00 Jan 10 2008 Page iv of xxx REJ09B0261 0100 ...
Page 74: ...2 Programming Model Rev 1 00 Jan 10 2008 Page 44 of 1658 REJ09B0261 0100 ...
Page 272: ...8 Caches Rev 1 00 Jan 10 2008 Page 242 of 1658 REJ09B0261 0100 ...
Page 376: ...10 Interrupt Controller INTC Rev 1 00 Jan 10 2008 Page 346 of 1658 REJ09B0261 0100 ...
Page 694: ...13 PCI Controller PCIC Rev 1 00 Jan 10 2008 Page 664 of 1658 REJ09B0261 0100 ...
Page 762: ...14 Direct Memory Access Controller DMAC Rev 1 00 Jan 10 2008 Page 732 of 1658 REJ09B0261 0100 ...
Page 788: ...15 Clock Pulse Generator CPG Rev 1 00 Jan 10 2008 Page 758 of 1658 REJ09B0261 0100 ...
Page 828: ...17 Power Down Mode Rev 1 00 Jan 10 2008 Page 798 of 1658 REJ09B0261 0100 ...
Page 846: ...18 Timer Unit TMU Rev 1 00 Jan 10 2008 Page 816 of 1658 REJ09B0261 0100 ...
Page 1292: ...24 Multimedia Card Interface MMCIF Rev 1 00 Jan 10 2008 Page 1262 of 1658 REJ09B0261 0100 ...
Page 1326: ...25 Audio Codec Interface HAC Rev 1 00 Jan 10 2008 Page 1296 of 1658 REJ09B0261 0100 ...
Page 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Page 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
Page 1688: ...Appendix Rev 1 00 Jan 10 2008 Page 1658 of 1658 REJ09B0261 0100 ...
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