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| 型號(hào)： | M34551E8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48 |
| 文件頁(yè)數(shù)： | 139/154頁(yè) |
| 文件大小： | 1778K |
| 代理商： | M34551E8-XXXFP |
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2-8
APPLICATION
2.1 I/O pins
4551 Group User’s Manual
2.1.4 Notes on use
(1)
Note when an I/O port is used as an input port
Set the output latch to “1” and input the port value before input. If the output latch is set to “0,” “L”
level can be input.
(2)
Noise and latch-up prevention
Connect an approximate 0.1
F bypass capacitor directly to the VSS line and the VDD line with the
thickest possible wire at the shortest distance, and equalize its wiring in width and length.
The CNVSS pin is also used as the VPP pin (programming voltage = 12.5 V) at the One Time PROM
version.
Connect the CNVSS/VPP pin to VSS through an approximate 5 k
resistor which is connected to the
CNVSS/VPP pin at the shortest distance.
(3)
Note on multifunction
Port D5 is also used as the INT pin.
Note that the port D5 output function can be used even when INT pin function is selected.
(4)
Connection of unused pins
Table 2.1.4 shows the connections of unused pins.
(5)
SD, RD instructions
When the SD and RD instructions are used, do not set “10002” or more to register Y.
Table 2.1.4 connections of unused pins
Pin
D0–D4, D5/INT
D6/XCIN, D7/XCOUT
P20/SEG16–P23/SEG19
CARR
SEG0–SEG15
COM0–COM3
P00–P03
P10–P13
Connection
Connect to VSS pin, or set the output latch to “0.”
Select D6 and D7 and connect to VSS, or set the output latch to “0” and open.
Select P2 and connect to VSS, or select segment output function and open.
Open.
Set the output latch to “1” and open.
Open or connect to VSS (Note).
Note: In order to connect ports P10–P13 to VSS, turn off their pull-up transistors (Pull-up control register
PU0i=“0”) by software. In order to make these pins open, turn on their pull-up transistors (register
PU0i=“1”) by software, or turn off their pull-up transistors (register PU0i=“0”) and set the output latch
to “0” (i = 0, 1, 2, or 3).
Be sure to select the key-on wakeup function and the pull-up function with every one port.
(Note in order to set the output latch to “0” and make pins open)
After system is released from reset, a port is in a high-impedance state until the output latch of the port
is set to “0” by software. Accordingly, the voltage level of pins is undefined and the excess of the supply
current may occur.
To set the output latch periodically is recommended because the value of output latch may change by
noise or a program run away (caused by noise).
(Note in order to connect unused pins to VSS or VDD)
To avoid noise, connect the unused pins to VSS or VDD at the shortest distance using a thick wire.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34551M4 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:4-BIT SINGLE-CHIP MICROCOMPUTER |
| M34551M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER |
| M34551M8 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:4-BIT SINGLE-CHIP MICROCOMPUTER |
| M34552G8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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