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TMP93CS41 数据表(PDF) 58 Page - Toshiba Semiconductor |
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TMP93CS41 数据表(HTML) 58 Page - Toshiba Semiconductor |
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58 / 248 page  TMP93CS40/TMP93CS41 2004-02-10 93CS40-56 Resetting makes the port pins listed below function as general-purpose I/O ports. I/O pins programmable for input or output are then set to function as input ports, except for P96/XT1 and P97/XT2. A program is needed to set port pins for built-in functions. Because the TMP93CS41 needs external ROMs, some ports are permanently assigned for memory interfacing. • P00 to P07 → AD0 to AD7 • P30 → • P10 to P17 → AD8 to AD15 (or A8 to A15) • P31 → * Note about the bus release and programmable pull-up/pull-down I/O ports. When the bus is released ( BUSAK = “0”), the output buffers of AD0 to AD15 and A0 to A23, as well as the control signals ( RD , WR , HWR , W / R , RAS , CS0 / 0 CAS to CS2 / 2 CAS ) are all set to OFF and they go into a high-impedance state. However, the states of the built-in programmable pull-up/pull-down resistors are retained when the bus is released. These programmable pull-up/pull-down resistors can be switched ON or OFF by programming when they are used as input ports. When they are used as output ports, they cannot be switched by programming. Table 3.5.4 shows the pin states when the bus is released ( BUSAK = “0”) Table 3.5.4 Pin States (when the bus is released) Pin States (when the bus is released) Pin Name Used as a Port Used for a Function P00 to P07 (AD0 to AD7) P10 to P17 (AD8 to AD15/A8 to A15) The state is not changed. (does not go to high-impedance (High-Z).) Goes to high-impedance (High-Z). P30 ( RD ) P31 ( WR ) Goes to high-impedance (High-Z). Goes to high-impedance (High-Z). P32 ( HWR ) P37 ( RAS ) The output buffer is OFF. The programmable pull-up resistor is ON only in the case that the output latch is equal to “1”. The output buffer is OFF. The programmable pull-up resistor is ON irrespective of the output latch. P36 ( W R/ ) P40 ( CS0 / 0 CAS ) P41 ( CS1 / 1 CAS ) The output buffer is OFF. The programmable pull-up resistor is ON only in the case that the output latch is equal to “1”. The output buffer is OFF. The state of the programmable pull-up resistor is retained when the bus is released. P42 ( CS2 / 2 CAS ) The output buffer is OFF. The programmable pull-down resistor is ON only in the case that the output latch is equal to “0”. The output buffer is OFF. The state of the programmable pull-down resistor is retained when the bus is released. P20 to P27 (A16 to A23) The state is not changed. (does not go to high-impedance (High-Z).) The output buffer is OFF. The programmable pull-down resistor is ON only in the case that the output latch is equal to “0”. RD WR |
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