SC9318FA Ver la hoja de datos (PDF) - Silan Microelectronics

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Fabricante

SC9318FA

DTS MICRO-CONTROLLER FOR PORTABLE RADIO RECEIVER

Silan Microelectronics 

SC9318-033

(Continued)

Pin No. Symbol

56

VDD

53

GND

54

FMIN

55

AMIN

57

RESET

58

XOUT

59

XIN

Description

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.

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.

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.

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.

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

(0.47µF Typ.) is connected.

(To be continued)

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:1.2 2003.05.20

Page 8 of 29

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