MAX6850 MAXIM [Maxim Integrated Products], MAX6850 Datasheet - Page 14

• Manufacturer Part Number: MAX6850
• Description: 4-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
numeric Vacuum-Fluorescent Display Controller
Table 9. Memory Mapping of User-Defined Font Register 0x05
Table 10. Font Pointer Address Behavior
Table 11. User-Definable Font Pointer Addresses
14
CHARACTER
RAM00 byte 0
RAM00 byte 1
RAM01 byte 0
RAM01 byte 1
RAM02 byte 0
RAM02 byte 1
RAM03 byte 0
RAM03 byte 1
RAM04 byte 0
RAM04 byte 1
RAM05 byte 0
RAM05 byte 1
RAM06 byte 0
RAM06 byte 1
RAM07 byte 0
RAM07 byte 1
RAM08 byte 0
RAM08 byte 1
RAM09 byte 0
RAM09 byte 1
RAM10 byte 0
COMMAND
FONT POINTER
ADDRESS
0x80 to 0xAE
0xB0 to 0xFF
ADDRESS
0x85
0x05
0x05
FONT
______________________________________________________________________________________
0xAF
REGISTER
0x00–0x7F
0x00–0x7F
0x80–0xFF
DEFAULT (BIN)
DATA
POWER-UP
Valid range to set the font address pointer. Pointer autoincrements after a font data read or write, while pointer
address remains in this range.
Further font data is ignored after a font data read or write to this pointer address.
Invalid range to set the font address pointer. Pointer is set to 0x80.
111 1110
000 0000
011 0000
000 0000
110 1101
000 0000
111 1001
000 0000
011 0011
000 0000
101 1011
000 0000
101 1111
000 0000
111 0000
000 0000
111 1111
000 0000
111 1011
000 0000
111 0111
READ OR
WRITE
Read
Write
Write
CHARACTER
7-segment 0
7-segment 1
7-segment 2
7-segment 3
7-segment 4
7-segment 5
7-segment 6
7-segment 7
7-segment 8
7-segment 9
7-segment A
POWER-UP
—
—
—
—
—
—
—
—
—
—
Read 7-bit user-definable font data entry from current font address. MSB of the
register data is clear. Font address pointer is incremented after the read.
Write 7-bit user-definable font data entry to current font address. Font address
pointer is incremented after the write.
Write font address pointer with the register data.
COMMAND
ADDRESS
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
REGISTER
ACTION
DATA
0x8A
0x8B
0x8C
0x8D
0x80
0x81
0x82
0x83
0x84
0x85
0x86
0x87
0x88
0x89
0x8E
0x8F
0x90
0x91
0x92
0x93
0x94
FUNCTION
D7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
REGISTER DATA
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0