
MOTOROLA
8-2
MC68HC05F32
LIQUID CRYSTAL DISPLAY DRIVER MODULE
8
8.1
LCD RAM
Data to be displayed on the LCD must be written into the LCD RAM. The LCD RAM is comprised
of 20 bytes of RAM (in the MC68HC05F32’s memory map) at $0054 – $0067. The 160 bits in the
LCD RAM correspond to the 160 segments that can be driven by the frontplane/backplane drivers.
Table 8-1 shows how the LCD RAM is organized. Writing a ‘1’ to a given location will result in the
corresponding display segment being activated when the EXTVON or INTVLCD bit is set. The
LCD RAM is a dual port RAM that interfaces with the internal address and data buses of the MCU.
It is possible to read from LCD RAM locations for scrolling purposes.
Table 8-1 LCD RAM organization
LCD RAM
Data
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
$54
FP1-BP3
FP1-BP2
FP1-BP1
FP1-BP0
FP0-BP3
FP0-BP2
FP0-BP1
FP0-BP0
$55
FP3-BP3
FP3-BP2
FP3-BP1
FP3-BP0
FP2-BP3
FP2-BP2
FP2-BP1
FP2-BP0
$56
FP5-BP3
FP5-BP2
FP5-BP1
FP5-BP0
FP4-BP3
FP4-BP2
FP4-BP1
FP4-BP0
$57
FP7-BP3
FP7-BP2
FP7-BP1
FP7-BP0
FP6-BP3
FP6-BP2
FP6-BP1
FP6-BP0
$58
FP9-BP3
FP9-BP2
FP9-BP1
FP9-BP0
FP8-BP3
FP8-BP2
FP8-BP1
FP8-BP0
$59
FP11-BP3
FP11-BP2
FP11-BP1
FP11-BP0
FP10-BP3
FP10-BP2
FP10-BP1
FP10-BP0
$5A
FP13-BP3
FP13-BP2
FP13-BP1
FP13-BP0
FP12-BP3
FP12-BP2
FP12-BP1
FP12-BP0
$5B
FP15-BP3
FP15-BP2
FP15-BP1
FP15-BP0
FP14-BP3
FP14-BP2
FP14-BP1
FP14-BP0
$5C
FP17-BP3
FP17-BP2
FP17-BP1
FP17-BP0
FP16-BP3
FP16-BP2
FP16-BP1
FP16-BP0
$5D
FP19-BP3
FP19-BP2
FP19-BP1
FP19-BP0
FP18-BP3
FP18-BP2
FP18-BP1
FP18-BP0
$5E
FP21-BP3
FP21-BP2
FP21-BP1
FP21-BP0
FP20-BP3
FP20-BP2
FP20-BP1
FP20-BP0
$5F
FP23-BP3
FP23-BP2
FP23-BP1
FP23-BP0
FP22-BP3
FP22-BP2
FP22-BP1
FP22-BP0
$60
FP25-BP3
FP25-BP2
FP25-BP1
FP25-BP0
FP24-BP3
FP24-BP2
FP24-BP1
FP24-BP0
$61
FP27-BP3
FP27-BP2
FP27-BP1
FP27-BP0
FP26-BP3
FP26-BP2
FP26-BP1
FP26-BP0
$62
FP29-BP3
FP29-BP2
FP29-BP1
FP29-BP0
FP28-BP3
FP28-BP2
FP28-BP1
FP28-BP0
$63
FP31-BP3
FP31-BP2
FP31-BP1
FP31-BP0
FP30-BP3
FP30-BP2
FP30-BP1
FP30-BP0
$64
FP33-BP3
FP33-BP2
FP33-BP1
FP33-BP0
FP32-BP3
FP32-BP2
FP32-BP1
FP32-BP0
$65
FP35-BP3
FP35-BP2
FP35-BP1
FP35-BP0
FP34-BP3
FP34-BP2
FP34-BP1
FP34-BP0
$66
FP37-BP3
FP37-BP2
FP37-BP1
FP37-BP0
FP36-BP3
FP36-BP2
FP36-BP1
FP36-BP0
$67
FP39-BP3
FP39-BP2
FP39-BP1
FP39-BP0
FP38-BP3
FP38-BP2
FP38-BP1
FP38-BP0
TPG
78
05F32Book Page 2 Tuesday, June 8, 1999 7:55 am