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H8/3002 Datasheet(PDF) 256 Page - Renesas Technology Corp |
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H8/3002 Datasheet(HTML) 256 Page - Renesas Technology Corp |
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256 / 700 page  9.2 Port 4 9.2.1 Overview Port 4 is an 8-bit input/output port with the pin configuration shown in figure 9-1. The pin functions differ between the 8-bit and 16-bit bus modes. When the bus width control register (ABWCR) designates areas 0 to 7 all as 8-bit-access areas, the H8/3002 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 H8/3002 operates in 16-bit bus mode and port 4 becomes the lower data bus. 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. Figure 9-1 Port 4 Pin Configuration 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) 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 D (input/output) D (input/output) D (input/output) D (input/output) D (input/output) D (input/output) D (input/output) D (input/output) 7 6 5 4 3 2 1 0 Port 4 pins 8-bit bus mode 16-bit bus mode Notes: 1. 2. Initial state in modes 1 and 3. Initial state in modes 2 and 4. *1 *2 242 |
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