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T89C5121-ICRIL Datasheet(PDF) 8 Page - ATMEL Corporation |
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T89C5121-ICRIL Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 110 page 8 T8xC5121 4164E–SCR–02/04 P0[7:0] AD[7:0] VCC I/O Input/Output function Port 0 P0 is an 8-bit open-drain bi-directional I/O port. Port 0 pins that have 1s written to them float and can be used as high impedance inputs. To avoid any parasitic current consumption, Floating P0 inputs must be pulled to VCC or VSS. I/O Address/Data low Mutiplexed Address/Data LSB for external access P2[7:0] A[15:8] VCC I/O Input/Output function Port 2 P2 is an 8-bit open-drain bi-directional I/O port with internal pull-ups O Address high Address Bus MSB for external access P3.6 WR DVCC O Write signal Write signal asserted during external data memory write operation P3.7 RD DVCC I Read signal Read signal asserted during external data memory read operation ALE VCC O Address latch enable output The falling edge of ALE strobes the address into external latch PSEN PSEN VCC O Program strobe enable EA EA VCC I External access enable This pin must be held low to force the device to fetch code from external program memory starting at address 0000h. It is latched during reset and cannot be dynamically changed during operation. Table 1. Ports Description (Continued) Port Signal Name Alternate Internal Power Supply ESD Type Description |
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