MC68HC705T16 MOTOROLA [Motorola, Inc], MC68HC705T16 Datasheet - Page 82

• Manufacturer Part Number: MC68HC705T16
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: MOTOROLA [Motorola, Inc]

9
9.4.3
SHDW - Shadow/border select
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 flyback 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 flyback signal, display wrap-around occurs. That is, all lines of the row display will have
all dots before the nth horizontal flyback displayed on one line and all remaining dots after the nth
horizontal flyback, along with all dots of next line before the (n+1)th horizontal flyback displayed
on the next line.
9.4.4
RiINTE - Row interrupt
Enable/disable interrupt of row i if one of the following conditions occur:
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
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1) the part of the row i display which is not overridden by other overlapping
2) the part of the row i display which does not overlap vertical retrace period
Address
Address
$28
$29
rows has been completed, or
has been completed.
Row Horizontal Position Register
Row Control Register 1
R3INTE R2INTE R1INTE R0INTE
SHDW
–
–
bit 7
bit 7
Shadow feature is selected if RiBE is enabled. See Section 9.4.1.
Border feature is selected if RiBE is disabled. See Section 9.4.1.
Row interrupt enabled.
Row interrupt disabled.
bit 6
bit 6
HP6
bit 5
bit 5
HP5
ON-SCREEN DISPLAY
bit 4
bit 4
HP4
R3EN
bit 3
bit 3
HP3
R2EN
bit 2
bit 2
HP2
R1EN
bit 1
HP1
bit 1
R0EN
bit 0
bit 0
HP0
0000 0000
0000 0000
on reset
on reset
MC68HC05T16
State
State
TPG