Controller Circuits
1-3
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.
Figure 1-3
RTC Circuit
Table 1-1
Radio Memory Requirements
RADIO
ROM (KB)
EXT RAM
(KB)
EEPROM
(KB)
Conventional MDC
GP140
128K
-
8K
Conventional 5 Tone
GP320, GP330,
GP340
512K
16K
16K
Conventional 5 Tone
GP360, GP380
512K
16K
16K
Privacy Plus
GP240, GP280
512K
16K
16K
SmartZone
GP540, GP580
512K
16K
16K
MPT
GP640, GP680
512K
16K
16K
MPT
GP1280
512K
16K
16K
LI_ION
R462
R419
3
4
2
1
5
CR411
1
2
3
Q416
C434
U410
3.3V
3
2
1
VIN VOUT
VSS
UNSWB+
R460
C435
R461
Vddd
HC11FL0
MODA
MODB
R420
R426
FL401
C436
C437
PI6
PI7
OUT
IN
GND
38.4kHz
UNSWB+
SWB+
6
4
1
3
2
3
5
1
2
4
CR413
R463
300
Q417
TEST_POINT
TP405
1
BOOT_CTRL
Summary of Contents for GP series
Page 1: ...Professional Portable Radio Detailed Service Manual 6866558D03 P ...
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Page 5: ...Professional Radio GP Series Service Maintainability Issue July 2007 ...
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Page 26: ...2 6 MAINTENANCE THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 32: ...4 2 Error Codes Notes ...
Page 33: ...Professional Radio GP Series Keypad and Flex Service Information Issue July 2007 ...
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Page 92: ...3 24 Controller Set 3 PCB 8486458Z03 UHF 8486686Z02 UHF2 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 98: ...3 30 Controller Set 4 PCB 8416256H02 UHF Controller Audio Power Amplifier Schematic Diagram ...
Page 101: ...Controller Set 5 PCB 8486743Z02 UHF 3 33 Controller Micro Processor Schematic Diagram ...
Page 102: ...3 34 Controller Set 5 PCB 8486743Z02 UHF Controller Interface Schematic Diagram ...
Page 103: ...Controller Set 5 PCB 8486743Z02 UHF 3 35 Controller Audio Power Amplifier Schematic Diagram ...
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Page 293: ...UHF PCB 8486743Z02 Schematics 3 149 UHF 403 470 MHz Receiver Front End Schematic Diagram ...
Page 294: ...3 150 UHF PCB 8486743Z02 Schematics UHF 403 470 MHz Receiver Back End Schematic Diagram ...
Page 295: ...UHF PCB 8486743Z02 Schematics 3 151 UHF 403 470 MHz Synthesizer Schematic Diagram ...
Page 297: ...UHF PCB 8486743Z02 Schematics 3 153 UHF 403 470 MHz Transmitter Schematic Diagram ...
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Page 316: ...3 172 UHF PCB 8415234H05 450 470 MHz Narrow Band THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 325: ...Professional Radio GP Series UHF2 450 527MHz Service Information Issue July 2007 ...
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Page 384: ...3 32 UHF2 PCB 8485677Z02 GP1280 Schematics THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 386: ...3 34 Voice Storage Parts List GP1280 THIS PAGE INTENTIONALLY LEFT BLANK ...
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Page 441: ...Professional Radio GP Series 800 MHz 806 870MHz Service Information Issue July 2007 ...
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