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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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T48C893 датащи(PDF) 27 Page - ATMEL Corporation |
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T48C893 датащи(HTML) 27 Page - ATMEL Corporation |
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27 / 82 page  T48C893 T48C893 Rev. A4, 22-Jan-02 27 (82) 4.2.4 Bidirectional Port 4 The bidirectional Port 4 is both a bitwise configurable I/O port and provides the external pins for the Timer 2, SSI and the voltage monitor input (VMI). As a normal port, it performs in exactly the same way as bidirectional Port 2 (see figure 26). Two additional multiplexes allow data and port direction control to be passed over to other inter- nal modules (Timer 2, VM or SSI). The I/O-pins for SC and SD line have an additional mode to generate an SSI– interrupt. All four Port 4 pins can be individually switched by the P4CR–register . Figure 26 shows the internal interfaces to bidirectional Port 4. Master reset Q V DD VDD BPxy Mask options * * PxDATy I/O Bus D I/O Bus I/O Bus * * Switched Switched * * S PxCRy S Q D PxMRy POut (Direction) PDir Intx * * PIn VDD Static Pull-up Static Pull-down pull-up pull-down Figure 26. Bidirectional Port 4 and Port 6 Port 4 Data Register (P4DAT) Primary register address: ’4’hex Bit 3 Bit 2 Bit 1 Bit 0 P4DAT P4DAT3 P4DAT2 P4DAT1 P4DAT0 Reset value: 1111b Port 4 Control Register (P4CR) Byte Write Auxiliary register address: ’4’hex Bit 3 Bit 2 Bit 1 Bit 0 P4CR First write cycle P41M2 P41M1 P40M2 P40M1 Reset value: 1111b Bit 7 Bit 6 Bit 5 Bit 4 Second write cycle P43M2 P43M1 P42M2 P42M1 Reset value: 1111b P4xM2, P4xM1 – Port 4x Interrupt mode/direction code |
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