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型號(hào)：	HD4074394S
元件分類：	微控制器/微處理器
英文描述：	4-BIT, OTPROM, MICROCONTROLLER, PDIP28
封裝：	DP-28S
文件頁(yè)數(shù)：	244/675頁(yè)
文件大?。?/td>	2183K
代理商：	HD4074394S

I/O Control

R1 and R2 are medium voltage NMOS open drain I/O ports and the D, R0, and R3 to R9 ports are

standard voltage I/O ports. The different port types have different circuit structures as follows.

(1) Medium Voltage NMOS Open Drain I/O Pin Circuit: R1 and R2 are medium voltage

NMOS open drain I/O ports and I/O through these ports is controlled by the port data registers

(PDR) and the data control registers (DCR). When the DCR bit corresponding to a given pin is 1,

that pin functions as an output pin and when the value in the PDR is 0, the pin’s NMOS transistor

turns on and the pin outputs a low level voltage. When the value in the PDR is 1 the pin goes to

the high impedance state. When a given DCR bit is 0, the corresponding pin functions as an input

(2) Standard Voltage CMOS Three State I/O Pin Circuit: The pins in the D, R0, and R3 to R9

ports are standard voltage CMOS three state I/O ports. I/O through these ports is controlled by the

PDRs and the data control registers (DCD or DCR). When the DCD or DCR bit corresponding to

a given pin is 1, that pin functions as an output pin and outputs the value in the PDR. When a

given DCD or DCR bit is 0, the corresponding pin functions as an input pin.

(3) Pull-Up MOS Control: Each I/O pin in the D, R0 and R3 to R9 ports has a built-in

programmable pull-up MOS transistor. When the miscellaneous register (MIS) MIS3 bit is set to 1

the pull-up MOS transistor for pins for which the corresponding PDR is set to 1 will be turned on.

Thus the on/off state of each pin can be controlled independently by the PDRs. Note that the pull-

up MOS transistor on/off settings are independent of the pin settings for use as built-in peripheral

module pins.

Table 12-2 shows how register settings control the port I/O pins.

Table 12-2 Register Settings for I/O Pin Control

Pull-up MOS transistor

Notes: 1. —: Off

2. The PDR registers are not allocated addresses in RAM. The PDR registers are

accessed by special-purpose I/O instructions.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD4074408C	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD4074408F	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD4074408H	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD4074408S	制造商:Renesas Electronics Corporation 功能描述:HIT 4 BIT MICROCOMPUTER (ZTAT)
HD4074418C	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller

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