Motorola MTP850 - The Menu; To Enter the Menu Items

B - 6 MTP850 TETRA Handportable Terminal / Basic Service Manual CONNECTOR PIN FUNCTIONS
GCAI Side Audio UC - Modes of Operation
Note: HIGH = Logic 1 = 2.775V +/- 10%,
LOW = Logic 0 = < 0.4V
Pin
No.
Pin Empty States
Default State
(Spkr & Mic)
“RSM”
Default State
(Spkr only)
“Earpiece”
IMPRES
State
“RSM /
Earpiece”
GMOI State
(Spkr & Mic)
“RSM”
GMOI State
(Spkr only)
“Earpiece”
1 GPIO-0 HIGH
(Interrupt)
LOW (Detach
Poll)
LOW (Detach
Poll)
LOW (Detach
Poll)
LOW (Detach
Poll)
LOW (Detach
Poll)
2 ADS / GMOI_DET HIGH (OPEN) HIGH (OPEN
after read
attempt)
HIGH (OPEN
after read
attempt)
HIGH (OPEN
after read
valid ADS)
HIGH (OPEN
after read
49.9K)
HIGH (OPEN
after read
20K)
3 OPT_5V / U+ OFF (0V) 5.0V 5.0V 5.0V 3.65V 3.65V
4 GPIO_1 HIGH HIGH (No
Function)
HIGH (No
Function)
HIGH
(Configurable)
HIGH (Not
Connected)
HIGH (Not
Connected)
5 GPIO_2 HIGH HIGH (No
Function)
HIGH (No
Function)
HIGH
(Configurable)
HIGH
(Configurable)
HIGH
(Configurable)
6 GND GND (0V) GND (0V) GND (0V) GND (0V) GND (0V) GND (0V)
7 SPKR+ OFF ON (Default
Profile)
ON (Default
Profile)
ON (IMPRES
Profile)
ON (GMOI
Profile)
ON (GMOI
Profile)
8 SPKR- OFF ON (Default
Profile)
ON (Default
Profile)
ON (IMPRES
Profile)
ON (GMOI
Profile)
ON (GMOI
Profile)
9 GPIO_3 HIGH HIGH (PTT) HIGH (PTT) HIGH (PTT) HIGH (PTT) HIGH (PTT)
10 MIC+ OFF ON (Default
Profile)
OFF ON (IMPRES
Profile)
ON (GMOI
Profile)
ON (GMOI
Profile)
11 MIC- GND (0V) GND (0V) GND (0V) GND (0V) GND (0V) GND (0V)
12 GPIO_4 HIGH HIGH (No
Function)
LOW
(Grounded on
Accy side)
HIGH (EMRG) HIGH (Not
Connected)
HIGH (Not
Connected)