поискавой системы для электроныых деталей |
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TC94A39FAG датащи(PDF) 5 Page - Toshiba Semiconductor |
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TC94A39FAG датащи(HTML) 5 Page - Toshiba Semiconductor |
5 / 20 page TC94A39FAG/FB 2003-04-01 5 Pin Functions Pin No. Symbol Pin Name Function and Operation Remarks 49 RESET Reset input System reset input pin for the device. A reset is applied while the RESET signal is low. When it is high, the 16.9344-MHz crystal oscillator (XI, XO) starts operating. The controller counts clock pulses from this oscillator and waits a specified standby time (approximately 50 ms) before starting the controller program from address 0. The CD processor is placed in the standby state at this time. Normally, raising the voltage on MVDD from 0 to 1.8 V or higher triggers a system reset (power-on reset) so that the RESET pin should be held at high. 50 51 P8-0 /MXI /OSC (BRK1) P8-1 /MXO (BRK2) I/O port 8-0 /crystal oscillator /CR oscillator I/O port 8-1 /crystal oscillator 2-bit CMOS I/O port. Input/output can be specified for each bit. When the pins are used as I/O port input, each pin can be pulled up or down by program. When backup release for clock stop mode or wait mode is enabled for the pins, a change in a pin can release the backup state. The program can set these pins to be used for a 75-kHz or 32.768-kHz dedicated crystal oscillator. The P8-0 pin can also be used for a CR oscillator. These clocks are used for the operation of the controller and peripheral devices. Upon a system reset, the 16.9344-MHz crystal oscillator (XI, XO) is selected as the clock for controller and peripheral device operation. The program can subsequently set the pins to oscillator pins and switch the clock generated from the oscillator to the controller clock. When the pins are used for an oscillator, executing the CKSTP instruction causes its oscillation to stop. (Note) When the P8-0 pin is used for a CR oscillator, the P8-1 pin can used as an I/O port pin. (Note) Backup release is enabled for both pins simultaneously. (Note) Use a crystal oscillator having a good startup characteristic. (Note) Upon a system reset, the pins are set to I/O port input. (Note) After setting the pins to oscillator pins, wait until oscillation settles before switching the controller clock. MXO Rout2 RfXT2 MXI MVDD MVSS (When used for crystal oscillator) MVDD R MVDD MVSS OSC C (When P8-0 is used for CR oscillator) MVDD MVDD RIN1 MVDD Input instructio MVSS (When used for I/O port) MVDD MVSS |
Аналогичный номер детали - TC94A39FAG |
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Аналогичное описание - TC94A39FAG |
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