VRC4171A

Using the VRC4171A Graphics Display Controller with the VR41xx Evaluation Board Application Note Description August 1999 The VR41xxTM 32-/64-bit MIPS® RISC microprocessors are members of NEC’s VR4100TM family of devices for Windows® CE handheld computer applications. The VRC4171TM companion chip for the VR41xx contains a PC CardTM controller, additional general-purpose I/Os, and an LCD graphic display controller. This application note explains operation of the VRC4171A’s LCD graphic display controller and connection of graphic displays to the VR41xx evaluation board. ! ! ! ! ! ! ! Features Color screen up to 64K shades (1, 2, 5, 6, 8,16 bits/pixel) Monochrome screen up to 16 gray scales (1, 2, 4 bits/pixel) On-chip color palette RAM (256 x 18 bits) and on-chip hardware cursor (32 x 32 x 2) Standard resolutions up to 640 x 480 for 16-bit color 600 x 800 for 8-bit color STN, DSTN, and TFT LCD panels Analog CRT interface (D/A converter required for analog CRT and analog TFT) The evaluation board includes an on-board digital-to-analog (D/A) converter for analog TFT and CRT interfaces, 44-pin LCD panel connector (N36), and four voltages for LCD panel power (Table 1). Table 1. LCD Voltages Voltage PANVDD Description LCD panel buffer type Jumper JP15 Setting 1-2 2-3 Selection 3.3-volt buffer 5-volt buffer 12 volts (fixed) Positive VEE (default) 15 to 25 volts adjustable Use VR1 for adjustment PANBKL PANVEE LCD panel VEE bias voltage control N/A JP16 N/A IN PANVBB LCD pan...