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PX8700
2.3.6 Logic Part
The logic part consists of internal CPU of MSM, RAM, MCP. The MSM6550 receives TCXO (=19.2MHz)
from the X101 and controls the phone in CDMA modes. The major components are as follows:
CPU
The ARM926J-S microprocessor includes a 3 stage pipelined RISC architecture, both 32-bit ARM and 16-bit
THUMB instruction sets, a 32-bit address bus, and a 32-bit internal data bus. It has a high performance and
low power consumption.
MCP
NAND Flash is used to store the terminal's program. Using the down-loading program, the program can be
changed even after the terminal is fully assembled.
SDRAM is used to store the internal flag information, call processing data, and timer data.
KEYPAD
For key recognition, key matrix is setup using KYPD[1][3][5][7][9][11][13][15][17][19][21] signal from
MSM6550. 18 LEDs and backlight circuitry are included in the keypad for easy operation in the dark.
LCD MODULE
LCD module contains a controller which will display the information onto the LCD by 16-bit data from the
MSM6550. It is also supplied stable +2.8V_LCD by Out3 in U402 for fine view angle and LCD reflects to
improve the display efficiency. 4 LEDs is used to display LCD backlight.
LG Electronics Inc.
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