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H8/3028F Datasheet(PDF) 289 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 289 Page - Renesas Technology Corp |
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289 / 923 page  Rev. 2.00, 09/03, page 259 of 890 8.5 Port 4 8.5.1 Overview Port 4 is an 8-bit input/output port with the pin configuration shown in figure 8.4. The pin functions differ depending on the operating mode. In modes 1 to 5 (expanded modes), when the bus width control register (ABWCR) designates areas 0 to 7 all as 8-bit-access areas, the chip operates in 8-bit bus mode and port 4 is a generic input/output port. When at least one of areas 0 to 7 is designated as a 16-bit-access area, the chip operates in 16-bit bus mode and port 4 becomes part of the data bus. In modes 6 and 7 (single-chip mode), port 4 is a generic input/output port. Port 4 has software-programmable built-in pull-up transistors. Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a darlington transistor pair. Port 4 P4 /D P4 /D P4 /D P4 /D P4 /D P4 /D P4 /D P4 /D 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 P4 (input/output)/D7 (input/output) P4 (input/output)/D6 (input/output) P4 (input/output)/D5 (input/output) P4 (input/output)/D4 (input/output) P4 (input/output)/D3 (input/output) P4 (input/output)/D2 (input/output) P4 (input/output)/D1 (input/output) P4 (input/output)/D0 (input/output) 7 6 5 4 3 2 1 0 Port 4 pins Modes 1 to 5 P4 (input/output) P4 (input/output) P4 (input/output) P4 (input/output) P4 (input/output) P4 (input/output) P4 (input/output) P4 (input/output) 7 6 5 4 3 2 1 0 Modes 6 and 7 Figure 8.4 Port 4 Pin Configuration |
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