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ST10F296 数据表(PDF) 128 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 128 Page - STMicroelectronics |
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128 / 346 page  Obsolete Product(s) - Obsolete Product(s) Parallel ports ST10F296E 128/346 During external access in multiplexed bus modes, Port 0 first outputs the 16-bit intra- segment address as an alternate output function. Port 0 is then switched to high impedance input mode to read the incoming instruction or data. In 8-bit data bus mode, two memory cycles are required for word access. The first memory cycle is for the low byte of the word and the second is for the high byte. During write cycles Port 0 outputs the data byte or word after outputting the address. During external access in de-multiplexed bus modes Port 0 reads the incoming instruction or data word or outputs the data byte or word (see Figure 32). When an external bus mode is enabled, the direction of the port pin and the loading of data into the port output latch are controlled by the bus controller hardware. The input of the port output latch is disconnected from the internal bus and is switched to the line labeled ‘alternate data output’ via a multiplexer. The alternate data can be the 16-bit intra-segment address or the 8/16-bit data information. The incoming data on Port 0 is read on the line ‘alternate data input’. While an external bus mode is enabled, the user software should not write to the port output latch, otherwise unpredictable results may occur. When the external bus modes are disabled, the contents of the direction register last written by the user becomes active. Figure 33 shows the structure of a Port 0 pin. Figure 32. Port 0 I/O and alternate functions Port 0 P0H P0L Alternate functions (a) (b) (c) (d) 16-bit demultiplexed bus 8-bit multiplexed bus 16-bit multiplexed bus D7 D6 D5 D4 D3 D2 D1 D0 P0L.7 P0L.6 P0L.5 P0L.4 P0L.3 P0L.2 P0L.1 P0L.0 P0H.7 P0H.6 P0H.5 P0H.4 P0H.3 P0H.2 P0H.1 P0H.0 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 A15 A14 A13 A12 A11 A10 A9 A8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 8-bit de-multiplexed bus General purpose input/output Obsolete Product(s) - Obsolete Product(s) |
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