B - 4 MTP700/MTP750 Portable Radios / Basic Service Manual CONNECTOR PIN FUNCTIONS
Table B-2 Bottom Accessory Connector Pin Functions
Pin Name Function Description
1 POWER GROUND IN/OUT Used as ground.
2 USB+/TXD (D+)/TDO IN/OUT +ve signal for the USB bus/transmit data in RS-232 mode/serial output in
JTAG Mode.
3 USB-/RXD (D-)/TDI IN/OUT -ve signal for the USB bus/receive data in RS-232 mode/serial input in
JTAG Mode.
4 USB_POWER/RTS/
RESET_IN
IN 5V power from USB Host/Used as Request-T0-Send in RS-232/Reset
input in JTAG Mode.
5 SWB+ OUT With a bottom accessory attached, this pin provides a typical voltage of
7.5V. It is current limited at 800mA against short circuit protection.
6. CTS/MCU_DE OUT/IN Used as Clear-To-Send in RS-232 mode/MCU Debug Event function in
JTAG Mode.
7. FS/DCD/DSP_DE IN/OUT This pin is used as Frame Sync in SSI mode/Used as Data Carrier Detect
in RS-232 mode/DSP Debug Event function in JTAG Mode.
8 SCK/RI/TCK IN/OUT This pin is used as Serial Clock in SSI mode/Used as RingIndicator in RS-
232 mode/Test Clock in JTAG Mode.
9 SRDA/DTR/TMS IN This pin receives serial data in SSI mode/Used as Data Terminal Ready in
RS-232 Mode/Test.
10 STDA/DSR/TRST OUT This pin transmit serial data in SSI mode/Used as Data Set Ready in RS-
232 Mode/Test Reset in JTAG Mode.
11. BOTTOM_OPTION_1 IN BOTTOM_OPTION1 and 2 selects the varioius radio operation modes
with different accessories.
12. BOTTOM_OPTION_2 IN BOTTOM_OPTION1 and 2 selects the various radio operation modes
with different accessories.
13. ON_OFF/JTAG/FLASH
MODE
IN Turns on the radio in SB9600 Mode/Puts the radio into JTAG Mode/Puts
the radio into FLASH Mode.
14. HEADSET
INDICATION/KEY_FAIL
IN Indicates a headset accessory is being used/Used to load the secure key
for encryption.
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