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M37220M3-157SP Datasheet(PDF) 5 Page - Mitsubishi Electric Semiconductor |
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M37220M3-157SP Datasheet(HTML) 5 Page - Mitsubishi Electric Semiconductor |
5 / 53 page MITSUBISHI MICROCOMPUTERS M37220M3-XXXSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER 5 Output port P5 CRT output HSYNC input VSYNC input DA output PIN DESCRIPTION (continued) P52/R, P53/G, P54/B, P55/OUT HSYNC VSYNC D-A Output Output Input Input Output Ports P52–P55 are a 4-bit output port. The output structure is CMOS output. Pins P52–P55 are also used as CRT output pins R, G, B, OUT respectively. The output structure is CMOS output. This is a horizontal synchronizing signal input for CRT display. This is a vertical synchronizing signal input for CRT display. This is an output pin for 14-bit PWM. Note : As shown in the memory map (Figure 3), port P0 is accessed as a memory at address 00C016 of zero page. Port P0 has the port P0 direction register (address 00C116 of zero page) which can be used to program each bit as an input (“0”) or an output (“1”). The pins programmed as “1” in the direction register are output pins. When pins are programmed as “0,” they are input pins. When pins are programmed as output pins, the output data are written into the port latch and then output. When data is read from the output pins, the output pin level is not read but the data of the port latch is read. This allows a previously-output value to be read correctly even if the output “L” voltage has risen, for example, because a light emitting diode was directly driven. The input pins are in the floating state, so the values of the pins can be read. When data is written into the input pin, it is written only into the port latch, while the pin remains in the floating state. |
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