參數(shù)資料
型號: 7549
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 19/73頁
文件大?。?/td> 1272K
代理商: 7549
Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 19 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Termination of unused pins
Termination of common pins
I/O ports:
Select an input port or an output port and follow
each processing method.
Output ports: Open.
Input ports:
If the input level become unstable, through current
flow to an input circuit, and the power supply
current may increase.
Especially, when expecting low consumption
current (at STP or WIT instruction execution etc.),
pull-up or pull-down input ports to prevent
through current (built-in resistor can be used).
We recommend processing unused pins through a
resistor which can secure IOH (avg) or IOL (avg).
Because, when an I/O port or a pin which have an
output function is selected as an input port, it may
operate as an output port by incorrect operation
etc.
Table 7
Termination of unused pins
Pin
Termination
P0
0
/INT
0
P0
1
/INT
1
P0
2
P0
3
P0
4
/R
X
D
P0
5
/T
X
D
P0
6
/S
CLK
P0
7
/S
RDY
P1
0
/AN
0
/KEY
0
/CMP
0
P1
1
/AN
1
/KEY
1
/CMP
1
P1
2
/AN
2
/KEY
2
/CMP
2
P1
3
/AN
3
/KEY
3
/T2
OUT
P1
4
/AN
4
/KEY
4
P1
5
/AN
5
/KEY
5
P1
6
/AN
6
/KEY
6
P1
7
/AN
7
/KEY
7
P2
0
/X
OUT
/X
COUT
Perform termination of I/O port.
Set the direction register to “1”, and
perform termination of output port.
Perform termination of I/O port.
P2
1
/X
IN
/X
CIN
P3
0
P3
1
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