13. Dot Matrix LCD Controller (H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 338 of 532
REJ09B0397-0300
13.2.6
Display Data Register (LR4)
7
D7
Undefined
R/W
6
D6
Undefined
R/W
5
D5
Undefined
R/W
4
D4
Undefined
R/W
3
D3
Undefined
R/W
0
D0
Undefined
R/W
2
D2
Undefined
R/W
1
D1
Undefined
R/W
Bit
Initial value
Read/Write
LR4 is an 8-bit read/write register used to perform read/write access to the display memory
specified by XA2 to XA0 and YA4 to YA0 in LR2.
In a write to display memory, the write is performed directly to the display memory via this
register. In a read, the data is temporarily latched into this register before being output to the bus.
After a reset, the display memory and LR4 contents are undefined.
13.2.7
Display Start Line Register (LR5)
7
⎯
⎯
⎯
6
⎯
⎯
⎯
5
⎯
⎯
⎯
4
ST4
0
W
3
ST3
0
W
0
ST0
0
W
2
ST2
0
W
1
ST1
0
W
Bit
Initial value
Read/Write
LR5 is an 8-bit write-only register that specifies the line at which display starts.
Upon reset, LR5 is initialized to H'00.
Bits 7 to 5—Reserved Bits:
Bits 7 to 5 are reserved; they should always be cleared to 0.
Bits 4 to 0—Display Start Line Setting (ST4 to ST0):
Bits 4 to 0 specify the line at which
display starts. Set a value of [display start line – 1].
Changing the setting in this register enables vertical scrolling to be implemented. The possible
settings are 0 to 31 for 1/32 duty, 0 to 15 for 1/16 duty, and 0 to 7 for 1/8 duty. Display will not be
performed normally if these ranges are exceeded.
Summary of Contents for F-ZTAT H8 Series
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