The good after service of cell phone jammer provided

33 to 40 for the voice interface, used to answer the phone handle.
The series has a standard 8051 MCU ports (0,1,2 and 3) and four additional ports (5, 6 and 7), so a total of 64 I / O port. Each I / O pins can be configured as push-pull or open-drain output. Fixed in the standard 8051's "weak" pull can be generally prohibited. This low-power applications further power saving capabilities. The most unique enhancement is the Digital Crossbar.
Phone all the software work processes are carried out under the CPU, including the specific division of the five processes described below. These processes are based on data in the form of software stored in the EEPROM and FLASHROM the phone when the phone's power supply module to detect the power key is pressed, the voltage will be converted to a mobile phone battery for mobile phones used by the various parts of the circuit voltage value to the appropriate power supply module, power supply voltage when the clock circuit to be generated after the shock signal into the logic circuit, CPU voltage and clock in the received signal power after the implementation of the program, the first read from the ROM boot code, the implementation of logic system self-test. The good after service of cell phone jammer provided by the cell phone jammer company deeply impress the customer.
And all the reset signal is asserted high, if the self-test passed, the CPU gives the watchdog (Watchdog) signal to the module, then the power module Watchdog (Watchdog) signal under the action of the state to maintain power. After the phone is switched on, both the search for radio control signal channel (BCCH) carrier frequency. Because the system at any time to all users in the district to send out user broadcast control information. Phone search to collect the strongest (BCCH) carrier frequency. Corresponding to the carrier frequency, read the frequency correction channel (FCCH), the mobile (MS), frequency and synchronization. So every morning in a different cell phone user location (either a different area) of the carrier frequency is fixed, it is a GSM network operator to determine when the network instead of GSM mobile phone by the user to decide. Phones to read synchronization channel (SCH) of information to identify base stations (BTS) of any other code, and sync to the high number of posts on a TDMA posts.
When connected to the PSTN from dial-MSC, and MSC will be the voice path to access the base station, SDCCH and check the legal validity of the user, then the messages sent between mobile phones and base stations. After a few seconds, the base station via the re moving to a mobile phone SDSSH inform arrangements for the TCH ARFCN and TS. Once again received TCH, the voice signal transmitted on the forward link, call successfully established, SDCCH be vacated.