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参数资料
型号： M38D29GCHP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封装： 10X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件页数： 57/138页
文件大小： 2880K
代理商： M38D29GCHP
Rev.3.02
Apr 10, 2008
Page 23 of 131
REJ03B0177-0302
38D2 Group
Termination of unused pins
Termination of common pins
I/O ports:
Select an input port or an output port and follow
each processing method.
In addition, it is recommended that related
registers be overwritten periodically to prevent
malfunctions, etc.
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 9
Termination of unused pins
Pin
Termination 1
Termination 2
Termination 3
P00/SEG0/(KW4)
P07/SEG7
I/O port
When selecting SEG output, open.
P10/SEG8
P17/SEG15
P20/SEG16
P27/SEG23/VL2
P30/SRDY2/(LED0),
P57/SRDY1/(KW3)
When selecting SRDY function,
perform termination of output port.
P31/SCLK2/(LED1),
P56/SCLK1/(KW2)
When selecting external clock input,
perform termination of input port.
When selecting internal clock output,
perform termination of output port.
P32/TXD2/(LED2),
P55/TXD1/(KW1)
When selecting TxD function, perform
termination of output port.
P33/RXD2/(LED3),
P54/RXD1/(KW0)
When selecting RxD function,
perform termination of input port.
P34/INT2/(LED4)
When selecting INT function, perform
termination of input port.
P35/TXOUT1/(LED5)
When selecting TXOUT function,
perform termination of output port.
P36/T2OUT/CKOUT/(LED6)
When selecting T2OUT function or CKOUT
function, perform termination of output port.
P37/CNTR0/TXOUT2/(LED7)
When selecting TXOUT function,
perform termination of output port.
P40/OOUT0/AN0,
P41/OOUT1/AN1
When selecting AN function, these
pins can be opened. (A/D conversion
result cannot be guaranteed.)
When selecting oscillation output,
perform termination of output port.
P42/AN2/ADKEY
When selecting ADKEY function,
pull-up this pin through a resistor.
P43/AN3
P47/RTP1/AN7
P50/INT0,
P51/INT1
When selecting INT function, perform
termination of input port.
P52/T3OUT/PWM0,
P53/T4OUT/PWM1
When selecting PWM, T3OUT, or T4OUT
function, perform termination of output port.
P60/CNTR1
When selecting CNTR input function,
perform termination of input port.
P61/XCIN,
P62/XCOUT
Do not select XCIN-XCOUT oscillation
function by program.
VL3
Set the VL3 connect bit to “1”
and apply a Vcc level
voltage to VL3 pin.
Set the VL3 connect bit to “0” and
leave the VL3 pin open.
COM0
COM3
Open
AVss
Connect to Vss
VREF
Connect to Vcc
XIN
When only on-chip oscillator
is used, connect to VCC
through a resistor.
XOUT
When external clock is input
or when only on-chip
oscillator is used, open.
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