Motorola GP series 서비스 정보 - 페이지 7

{카테고리_이름} Motorola GP series에 대한 서비스 정보을 온라인으로 검색하거나 PDF를 다운로드하세요. Motorola GP series 30 페이지. Professional radio
Motorola GP series에 대해서도 마찬가지입니다: 서비스 매뉴얼 (26 페이지), 서비스 정보 (24 페이지), 서비스 정보 (31 페이지), 서비스 정보 (43 페이지), 사용자 설명서 (16 페이지), 매뉴얼 (30 페이지)

Motorola GP series 서비스 정보
Controller Circuits
Conventional MDC
Conventional 5 Tone
Conventional 5 Tone
Privacy Plus
SmartZone
MPT
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
IN
R426
C437
Figure 1-3 RTC Circuit
ROM (KB)
128K
512K
512K
512K
512K
512K
512K
Vddd
R461
C435
CR411
1
Q416
2
3
2
1
R462
R463
CR413
300
5
1
4
Q417
3
2
1
6
2
UNSWB+
SWB+
3
4
EXT RAM
EEPROM
(KB)
(KB)
-
8K
16K
16K
16K
16K
16K
16K
16K
16K
16K
16K
16K
16K
UNSWB+
U410
3.3V
2
3
VIN VOUT
C434
R460
5
4
R419
3
LI_ION
BOOT_CTRL
TP405
TEST_POINT
1-3