Motorola GP340 ATEX Service Information - Page 7

Browse online or download pdf Service Information for Radio Motorola GP340 ATEX. Motorola GP340 ATEX 30 pages. Professional radio, power distribution and controller
Also for Motorola GP340 ATEX: Specification Sheet (5 pages), User Manual (31 pages), Specification Sheet (2 pages), User Manual (30 pages), User Manual (30 pages), Basic User's Manual (10 pages), Service Information (32 pages), Service Information (30 pages), Service Information (26 pages), Service Information (24 pages), Service Information (31 pages), Service Information (43 pages)

Print Page

Controller Circuits

Conventional MDC

Conventional 5 Tone

Privacy Plus

SmartZone

MPT

3.3

Real Time Clock

( Refer to Figure 1-3 and the Microprocessor schematic diagram )

Radios with displays support a Real Time Clock (RTC) module for purposes of message time

stamping and time keeping. The RTC module resides in the microcontroller.The clock uses a back-

up Lithium Ion battery for operating power when the primary battery is removed.

3.3.1

Circuit Description

The RTC module circuit, shown in Figure 1-3, is powered by the ModB/Vstby pin and PI6/PI7 from

the crystal oscillator circuit. A clock frequency of 38.4kHz from a crystal oscillator provides the

reference signal which is divided down to 1 Hz in the processor.

HC11FL0

MODA

MODB

PI6

PI7

As the RTC module is powered separately from the processor Vdd, the RTC is kept active through

the ModB / Vstby pin which provides the Lithium battery back-up power when the radio is switched

off.

Table 1-1 Radio Memory Requirements

RADIO

GP140

GP320, GP340

GP360, GP380

GP240, GP280

GP540, GP580

GP640, GP680

GP1280

FL401

C436

OUT

R420

38.4kHz

GND

R426

C437

Figure 1-3 RTC Circuit

ROM (KB)

128K

512K

Vddd

R461

C435

CR411

Q416

R462

R463

CR413

300

Q417

UNSWB+

SWB+

EXT RAM

EEPROM

(KB)

16K

UNSWB+

U410

3.3V

VIN VOUT

C434

R460

R419

LI_ION

BOOT_CTRL

TP405

TEST_POINT

1-3