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
Содержание GP series
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