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MC68HC05T16 Datasheet, PDF (82/128 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit | |||
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9.4.3 Row Horizontal Position Register
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$28 SHDW HP6 HP5 HP4 HP3 HP2 HP1 HP0 0000 0000
SHDW - Shadow/border select
1 (set) â Shadow feature is selected if RiBE is enabled. See Section 9.4.1.
0 (clear) â Border feature is selected if RiBE is disabled. See Section 9.4.1.
HP6 to HP0 - Horizontal Position
Each (HP6-HP0) step shifts the horizontal position of all four rows by 4 dots. The reference point
of shift is the leading edge of horizontal ï¬yback signal. Note that there is only one Row Horizontal
Position register for all 4 row buffers, therefore all rows will have the same horizontal start point.
If (HP6-HP0) is so programmed that part of the row display goes beyond the beginning of a
horizontal ï¬yback signal, display wrap-around occurs. That is, all lines of the row display will have
all dots before the nth horizontal ï¬yback displayed on one line and all remaining dots after the nth
horizontal ï¬yback, along with all dots of next line before the (n+1)th horizontal ï¬yback displayed
on the next line.
9.4.4 Row Control Register 1
9
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$29 R3INTE R2INTE R1INTE R0INTE R3EN R2EN R1EN R0EN 0000 0000
RiINTE - Row interrupt
1 (set) â Row interrupt enabled.
0 (clear) â Row interrupt disabled.
Enable/disable interrupt of row i if one of the following conditions occur:
1) the part of the row i display which is not overridden by other overlapping
rows has been completed, or
2) the part of the row i display which does not overlap vertical retrace period
has been completed.
Note that for the case where row i is completely overlapped by other rows, row i display has never
really happened, that is, terminated upon its commencement, row i interrupt will never occur.
MOTOROLA
9-12
ON-SCREEN DISPLAY
TPG
MC68HC05T16
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