Freescale Semiconductor Microcontrollers - Manual (Page 608)

ColdFire V1 Full Chip Simulation Connection
FCS Visualization Utilities
608 Microcontrollers Debugger Manual
LCD Component
The LCD Display component message box shown in Figure 28.30 is the LCD utility,
which can display one or two lines of 16 characters and show or hide the position cursor.
Figure 28.30 LCD Display Message Box
The display module consists of two 8-bit-wide parallel couplers: a data port and a control
port, as shown in
Figure 28.31 . These ports communicate with the mainframe.
Figure 28.31 The LCD Display Module Ports
The bits d7-d0 represent an ASCII code to display characters or an instruction code. The
RS bit defines the status of bits d7-d0.
LCD Operation
The LCD Display device can display one or two lines of 16 characters and show or hide
the position cursor.
To manage the display, this device contains a controller: the DDRAM (Display Data
RAM). The DDRAM stores the ASCII codes of characters written during a write
operation. Only two lines of 16 characters each can be displayed but up to 64 characters
can be stored.
This RAM can be seen as organized in two lines: the first one starts at address 00h and
ends at 1Fh, and the second one starts at 40h and ends at 5Fh.
Figure 28.32 illustrates this
arrangement.