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TSSIO16E-TISA Datasheet(PDF) 10 Page - ATMEL Corporation |
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TSSIO16E-TISA Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 19 page 10 4421B–ASSP–10/05 TSSIO16E 4.5 State on power on and safety mode This table indicates the state of ports A and B and the INT pin on power on and changeover to the safety mode. In power on mode the command register is initialized to 0. • selection of RDX0 acces in automatic mode, • line diagnosis activated, • access free peripheral. 4.5.1 Condition for enter in safety mode (see Figure ) 4.5.2 Condition for exit from safety mode Writing of port A is a way of exiting from the safety mode. Pin INT returns to 0. Example: Case of a LCD display with a TSSIO16E shared simul- taneously by car radio and vehicle computer. In this case, the car radio (B7 = 1) inhibits access to the display line until the full mes- sage is displayed. This access control strategy is only meaningful if the computer (car radio or on-board computer) wants access to the peripheral (display) and reads the control register to ensure that the periph- eral is available. Writing to the port is never inhibited. car radio VAN lines VAN lines vehicle computer LCD display with TSSIO16E power-on safety mode Port A high Z high Z Port B high Z unchanged INT pin 0 1 • After reset: in the absence of writing or reading in the circuit for a SLTO • During operation: in the presence of coherent frames but the absence of reading or writing in the circuit for a LTO |
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