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SC9318FB-033 Datasheet(PDF) 8 Page - Silan Microelectronics Joint-stock

Part # SC9318FB-033
Description  DTS MICROCONTROLLER FOR PORTABLE RADIO RECEIVER
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Manufacturer  SILAN [Silan Microelectronics Joint-stock]
Direct Link  http://www.silan.com.cn
Logo SILAN - Silan Microelectronics Joint-stock

SC9318FB-033 Datasheet(HTML) 8 Page - Silan Microelectronics Joint-stock

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SC9318-033
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
REV:1.2
2003.05.20
Http: www.silan.com.cn
Page 8 of 29
(Continued)
Pin No.
Symbol
Description
56
VDD
53
GND
Power-supply pins;
Pins to which power is applied.
Normally, VDD=1.8~3.6V (3.0V Typ.) is applied.
In back-up mode (when CKSTP instructions are being executed), voltage can be
lowered to 1.0V. If voltage falls below 1.5V while the CPU is operating, the CPU
stops to prevent malfunction (STOP mode). When the voltage rises above 1.5V, the
CPU restarts.
STOP mode can be detected by checking the STOP F/F bit. If necessary, execute
initialization or adjust clock by program.
When detecting or preventing CPU malfunctions using an external circuit, STOP
mode can be invalidated and rendered non-operative by program. In that case, all
four bits of the internal TEST port should be set to “1”.
If more than 1.8V is applied when the pin voltage is 0, the device’
s system is reset
and the program starts from address “0”. (power on reset).(Note)
To operate the power on reset, the power supply should start up in 10~100ms.
54
FMIN
FM programmable counter input;
Programmable counter input pin for FM,VHF band.
The 1/2+pulse swallow system (VHF mode) and the pulse swallow system (FM
mode) are selectable freely by program. At the VHF mode, local oscillation output
(VCO output) of 50~230MHz (0.2VP-P(Min)) is input and FM mode, 40~130MHz
(0.2VP-P (Min)) is input. A built-in input amp and C coupling allow operation at low-
level input. (Note) when in the PLL OFF mode or when set to AMIN input, the input is
pulled down.
55
AMIN
AM local oscillator signal input;
Programmable counter input pin for AM band.
The pulse swallow system (HF mode) and direct dividing system (LF mode) are freely
selectable by program. At the HF mode, local oscillation output (VCO output) of
1~45MHz (0.2VP-P(Min)) is input and LF mode, 0.5~12MHz (0.2VP-P(Min)) is input.
Built-in input amp operates with low-level input using a C coupling.
(Note) When in PLL OFF mode or when set to FMIN input, the input is pulled down.
57
RESET
Reset input;
Input pin for system reset signals.
RESET
takes place while at low level; at high level, the program starts from
address”0”.
Normally, if more than 1.8V is supplied to VDD when the voltage is 0, the system is
reset (Power on reset).
Accordingly, this pin should be set to high level during operation.
58
XOUT
59
XIN
Crystal oscillator pins.
A reference 75kHz crystal oscillator is connected to the XIN and XOUT pins. The
oscillator stops oscillating during CKSTP instruction execution.
The VXT pin is the power supply for the crystal oscillator. A stabilizing capacitor
(0.47
µF Typ.) is connected.
(To be continued)


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