Motorola pro7100 Manuel de service télécharger pdf (Page 20)

2-6 Theory of Operation

The option board interfaces are different in that the µP can also read data back from devices

connected.The timing and operation of this interface is specific to the option connected, but the

general pattern is as follows:

Option board generates a service request via J0551, pin 29, line RDY, and µP, pin 79

The main board asserts a chip select for that option board via U0141,pin 14, line OPT CS,

J0551,pin 30

The main board µP generates the CLK (J0551, pin 3)

The main board µP writes serial data via J0551, pin 15 and reads serial data via J0551, pin 16

When data transfer is complete the main board terminates the chip select and CLK activity

2.2.8 SBEP Serial Interface

The SBEP serial interface allows the radio to communicate with the Customer Programming

Software (CPS), or the universal tuner via the Radio Interface Box (RIB). This interface connects to

the microphone connector via control head connector (J0401, pin 8) or to the accessory connector

J0401, pin 17 and comprises BUS+. The line is bi-directional, meaning that either the radio or the

RIB can drive the line. The µP sends serial data via pin 98 and D0101 and it reads serial data via pin

97. Whenever the µP detects activity on the BUS+ line, it starts communication.

In addition, the SBEP serial interface is used to communicate with a connected control head. When a

control head key is pressed or the volume knob is rotated, the line ON OFF CONTROL goes high.

This turns on transistor Q0110 which pulls line ON OFF SENSE and µP, pin 6 to ground level. In

addition, an interrupt is generated via R0109 (for SELECT 5 / MDC models) or R0128, U0125, pins

17/26 (for MPT models) and µP, pin 96. This indicates that the control head wants to start SBEP

communication. The µP then reads the registers of the Universal Asynchronous Receiver Transmitter

(UART) U0125 to determine whether the interrupt source was the control head or the UART (MPT

models only). If the interrupt source was from the control head, the µP requests the data from the

control head. The control head starts sending and after all data has been sent, the ON OFF

CONTROL line goes low. The control head ignores any data on BUS+ during SBEP communication

with the CPS or universal tuner.

2.2.9 General Purpose Input/Output

The controller provides eight general purpose lines (DIG1 through DIG8) available on the accessory

connector J0501 to interface the external options. Lines DIG IN 1,3,5,6, are inputs, DIG OUT 2 is an

output and DIG IN OUT 4,7,8 are bidirectional. The software and the hardware of the radio model

define the function of each port.

DIG IN 1 can be used as external PTT input or others, set by the CPS. The µP reads this port via pin

77 and Q0171.

DIG OUT 2 can be used as normal output or external alarm output, set by the CPS. Transistor Q0173

is controlled by the µP via ASFIC CMP, pin 14.

DIG IN 3 is read by µP, pin 63 via resistor R0176

DIG IN 5 can be used as normal input or emergency input, set by the CPS. The µP reads this port via

R0179 and µP, pin 60. Diode D0179 limits the voltage to protect the µP input.

DIG IN 6 can be used as normal input, set by the CPS. The µP reads this port via, pin 74 and Q0181.

DIG IN OUT 4,7,8 are bidirectional and use the same circuit configuration. Each port uses an output

transistor Q0177, Q0183, Q0185 controlled by µP, pins 46, 47, 53. The ports are read by µP, pins 75,

54, 76. To use one of the ports as input the µP must turn off the corresponding output transistor.

In addition the signals from DIG IN 1, DIG IN OUT 4 are fed to the option board connector J0551 and

the expansion board connector J0451.

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Motorola pro7100 Manuel de service Page 20

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