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MC68HC908LJ24 Datasheet, PDF (350/464 Pages) Motorola, Inc – Microcontrollers | |||
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Freescale Semiconductor, Inc.
Liquid Crystal Display (LCD) Driver
17.2 Introduction
This section describes the liquid crystal display (LCD) driver module.
The LCD driver module can drive a maximum of 33 frontplanes and 4
backplanes, depending on the LCD duty selected.
17.3 Features
Features of the LCD driver module include the following:
⢠Software programmable driver segment configurations:
â 32 frontplanes à 4 backplanes (128 segments)
â 33 frontplanes à 3 backplanes (99 segments)
â 33 frontplanes à 1 backplane (33 segments)
⢠LCD bias voltages generated by internal resistor ladder
⢠Software programmable contrast control
17.4 Pin Name Conventions and I/O Register Addresses
Three dedicated I/O pins are for the backplanes, BP0âBP2; sixteen
dedicated I/O pins are for the frontplanes, FP1âFP10 and FP27âFP32;
and the sixteen frontplanes, FP11âFP26, are shared with port C and E
pins. FP0 and BP3 shares the same pin and configured by the
DUTY[1:0] bits in the LCD clock register.
The full names of the LCD output pins are shown in Table 17-1. The
generic pin names appear in the text that follows.
Table 17-1. Pin Name Conventions
LCD Generic Pin Name
FP0/BP3
BP0âBP2
FP1âFP10
FP11âFP18
FP19âFP26
FP27âFP32
Full MCU Pin Name
FP0/BP3
BP0âBP2
FP1âFP10
PTE0/FP11âPTE7/FP18
PTC0/FP19âPTC7/FP26
FP27âFP32
Pin Selected for LCD Function by:
â
â
â
PEE in CONFIG2
PCEL:PCEH in CONFIG2
â
Data Sheet
350
MC68HC908LJ24/LK24 â Rev. 2
Liquid Crystal Display (LCD) Driver
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
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