參數(shù)資料
型號： M37544G2ASP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝： 28 X 8.90 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件頁數(shù)： 11/75頁
文件大?。?/td> 649K
代理商： M37544G2ASP
7544 Group (QzROM version)
REJ03B0108-0103
Rev.1.03
Mar 31, 2009
page 19 of 72
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.
Pin
P00/CNTR1
P01, P02
P03/TXOUT
P04 to P07
P10/RxD
P11/TxD
P12/SCLK
P13/SRDY
P14/CNTR0
P20/AN0 to
P25/AN5
P30 to P33
P34/INT1
P37/INT0
VREF
XIN
XOUT
Termination 1
(recommend)
I/O port
Vss.
When only on-
chip oscillator
is used,
connect to
VCC through a
registor.
When external
clock is input
or when only
on-chip
oscillator is
used, open.
Termination 2
When selecting CNTR1 input function,
perform termination of input port.
-
When selecting TXOUT function, perform
termination of output port.
-
When selecting RXD function, perform
termination of input port.
When selecting TXD function, perform
termination of output port.
When selecting external clock input, perform
termination of input port.
When selecting SRDY function, perform
termination of output port.
When selecting CNTR0 input function,
perform termination of input port.
When selecting AN function, perform
termination of input port.
-
When selecting INT1 function, perform
termination of input port.
When selecting INT0 function, perform
termination of input port.
-
Termination 3
When selecting CNTR1 output function,
perform termination of output port.
-
When selecting internal clock output,
perform termination of output port.
-
When selecting CNTR0 output function,
perform termination of output port.
-
Termination 4
When selecting key-on
wakeup function, per-
form termination of input
port.
-
Table 7 Termination of unused pins
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.
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