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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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7220 데이터시트(PDF) 47 Page - Renesas Technology Corp |
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7220 데이터시트(HTML) 47 Page - Renesas Technology Corp |
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47 / 303 page  FUNCTIONAL DESCRIPTION 2.4 Input/Output pins 7220 Group User’s Manual 2-20 2.4 Input/Output pins The M37221M6-XXXSP/FP has 33 programable ports (I/O ports, input ports, output ports). The double- function ports function as ports and as pins for internal peripheral devices. M37220M3-XXXSP/FP Refer to “CHAPTER 4. M37220M3-XXXSP/FP.” qDouble-function ports .................... <I/O ports> P00–P07, P10–P17, P20–P24, P30, P31 <Input ports> P33, P34 <Output ports> P52–P55 qI/O port-only ports ......................... <I/O ports> P25–P27, P32 And also, the M37221M6-XXXSP/FP has 9 pins with only the dedicated function. qDediated pins ................................. ________ VCC, VSS, RESET, XIN, CNVSS, XOUT, D-A, HSYNC, VSYNC 2.4.1 Programmable ports (1) Port P0 Port P0 is an 8-bit input/output port. This is an N-channel open drain output. Port P0 is assigned to memory at address 00C016 on zero page. Port P0 has the direction register (at address 00C116 on zero page), so that it is possible to program each bit whether the port is used for input or output. The pins of which the direction register is programmed to “0” are set for input; when programmed to “1”, the pins are set for output. When pins are programmed as output pins, the output data are written into the port latch and then output. When reading data from the output pins, the output pin level is not read but the port latch data is read. This allows a previously-output value to be read correctly even if the output LOW voltage has risen, for example, because a light emitting diode was directly driven. The input pins float, so the values of the pins can be read. When writing data into the input pin, it is written only into the port latch, while the pin remains floating. Ports P00–P05 are also used as PWM output pins PWM0–PWM5 respectively. Port P06 is also used as external interrupt pin INT2 and analog input pin A-D4. The P07 pin is also used as external interrupt input pin INT1. When external interrupts INT1 and INT2 are enabled, an interrupt is processed according to transition in the level on these pins. Ports P06 and P07 have the schmit characteristics when they are used as INT input pins. In this case, set these pins for input by the port P0 direction register. |
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