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Z8631904SSC Datasheet(PDF) 8 Page - Zilog, Inc. |
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Z8631904SSC Datasheet(HTML) 8 Page - Zilog, Inc. |
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8 / 23 page  Z86319 PS/2 Mouse Controller Zilog 8 P R E L I M I N A R Y DS97KEY1605 PIN FUNCTIONS Port 0 (P02-P00). Port 0 is a 3-bit, I/O programmable, bi- directional, CMOS-compatible I/O port. These three I/O lines can be configured under software control to be input or output (Figure6). When Port 0 is configured as an input port, all lines have the capability to either sink or source (ROM mask selectable) current emulating a 100K pull- down or pull-up resistor. Port 00-02 can be accessed through the P0 register (register address 00). The upper 5 bits of this 8-bit register always reads “11111.” Writing to the upper 5 bits has no effect (see Figure 34). The lower 3 bits of the P0 register are read/write. Current versus pin voltage graphs are shown in Figures 7 and 8. Figure 6. Port 0 Configuration OE Out In Pad Pull-Down / Enable (Mask Option) Pull-Up Enable (Mask Option) |
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