參數(shù)資料
型號(hào)： TPU2735
廠商： Electronic Theatre Controls, Inc.
英文描述： Teletext Processor
中文描述： 圖文處理器
文件頁(yè)數(shù)： 27/37頁(yè)
文件大?。?/td> 1019K
代理商： TPU2735
TPU 2735
27
7.8. The Memory Control Register, R-MC
R-MC provides an easy way to clear parts of the se-
lected RAM sector.
R-MC Memory Control Register
address 0/24/30, 1-byte register
RGBE
ABO
SST
CR2
D7
D6
D5
D4
D3
D2
D1
D0
RGBI
AB1
CDS
*
*
*
CR1
*
RGBE:
switch external RGB signal to the
RGB outputs (see section 3.3.,
pin 10).
RGBI:
indicator for external blanking in line 6,
i.e. constant external blanking
ABx:
Address of current acquisition block
SST:
SST = stop on same page header. SST = 1 makes the
TPU close a page whenever a new page header of the
same magazine is received. Default value is SST = 0.
is for testing purposes only
CDS:
CDS = 1 clears the data part of the selected display sec-
tor.
clear display sector;
Depending on the DLS control bit in R_DC5 of RC2, 24
or 25 lines of the sector will be written. Also the “Display
Header Options” (ref. to R_DAC in section 7.5) influence
the write operation: if “Rolling Header” or “Rolling Time”
is selected, the respective areas in the rolling header
and/or rolling time fields are cleared and the contents of
the current display page remains unchanged. If CDS is
set to 1 the display period of the subsequent field is
turned into an erase period: read is turned to write, and
data is stuck to blank (0x20). The next field resets CDS
to 0.
CR1:
clear register chain 1 of the selected
display sector
CR2:
clear register chain 2
CR1(2) = 1 clears all bits of all registers of register chain
1(2). This is done in the field following the clear com-
mand in line 25, 26. CR1(2) is reset by the TPU when the
clear command is executed. Power-up reset makes
CR2 = 1.
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