Motorola MTP700 Detailed Service Manual page 150

4.2 - 28
Backlight and LEDs
Backlight
The keypad backlight consists of 8 green LEDs. There are 2 more LEDs in the LCD mod-
ule that are connected in parallel to the keypad LEDs.
Top LEDs
There is a tri-color (Green, Red and Amber when both turns on) LED located on the main
board. These LED colors are used as indicators to the radio operation.
Radio Programming
The radio is entered into programming mode by setting the MOD pin high level, and
applying a preamble sequence to the radio via the RS232 lines. A 12Vdc can be applied
to pin 15 on the 16-pin connector to set the radio into flashing mode.
The MOD pin assertion is encountered at least 4 CKIH cycles before the negation of the
Reset pin.
Accessory Connector
The radio provides two connectors for access to personal computers, data devices and
audio accessories.
Bottom Connector
The 14-pin bottom connector is intended to support connection to personal computers,
and test systems. The bus has seven standard modes of operation: Normal (Nothing
Connected), USB Mode, Emergency, PTT, RS232 Mode 4-wire, RS232 8-wire/SSI Mode
and SB9600 mode. There are also three additional non-standard modes, KEYLOAD,
FLASH, and JTAG, which are used only for secure keyloading, development, factory pro-
gramming and debugging.
These modes are selected by applying appropriate logic levels to the Option Select pins,
named OPTION1 and OPTION2. Some of the modes listed above are selected by the
additional application of a level on the USB POWER and CE_ON_OFF pins as well.
Mode Select (OPTION1 and OPTION2)
Logic levels applied to the OPTION1, OPTION2, USB POWER, and ON_OFF/JTAG/
FLASH lines are used to select the different modes. The modes will be set as follows:
MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 800 MHz