HD66724 Datasheet, PDF (46/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
Horizontal Scroll Control
SSE: When SSE = 0, it selects SE2 and SE1 bits and when SSE = 1, it selects SE3 and SE4 bits.
SE3-1: Specifies the horizontal smooth scroll display for a given line. When SE = 1, the first line is
displayed in a horizontal scroll. When SE = 1, the second line is displayed in a horizontal scroll. When SE
= 1, the third line is displayed in a horizontal scroll. When SE = 4, the fourth line is displayed in a
horizontal scroll. Horizontal scroll display of multiple lines is possible.
SQ2-0: Shifts the line to which horizontal smooth scroll is specified by units of 3 dots, up to 21 dots, to the
left. For details, see the Horizontal Smooth Scroll section.
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
1
01
1
SE2 SE1
SSE
(SSE = 0)
SE4 SE3 _{(SSE = 1)}
0 0 0 1 1 0 0 SQ2 SQ1 SQ0
Figure 18 Horizontal Scroll Control Instruction
Table 25 SQ Bits and Display Start Line
SQ2
0
0
0
0
1
1
1
1
SQ1
0
0
1
1
0
0
1
1
SQ0
0
1
0
1
0
1
0
1
Display Start Line
Displayed with no shift
Displayed with 3 dots shifted to the left
Displayed with 6 dots shifted to the left
Displayed with 9 dots shifted to the left
Displayed with 12 dots shifted to the left
Displayed with 15 dots shifted to the left
Displayed with 18 dots shifted to the left
Displayed with 21 dots shifted to the left
Key Scan Control
IRE: When IRE = 1, it permits interrupts when a key is pressed. This causes interrupts to occur in the
standby period when the oscillator clock is halted, as well as key scan interrupts during normal operation,
allowing system wake-up.
KF1-0: Sets the key scan cycle. The following table shows the key scan pulse width and key scan cycle
used when the oscillation frequency (fosc) is 32 kHz, which depend on the oscillation frequency. For
details, see the Key Scan Control section.
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