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参数资料
型号： M38D29FFFP
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： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数： 25/136页
文件大小： 2856K
代理商： M38D29FFFP
Rev.3.02
Apr 10, 2008
Page 120 of 131
REJ03B0177-0302
38D2 Group
3. Direction Registers
The values of the port direction registers cannot be read. This
means, it is impossible to use the LDA instruction, memory
operation instruction when the T flag is “1”, addressing mode
using direction register values as qualifiers, and bit test
instructions such as BBC and BBS. It is also impossible to use bit
operation instructions such as CLB and SEB, and read-modify-
write instructions to direction registers, including calculations
such as ROR. To set the direction registers, use instructions such
as LDM or STA.
4. Pull-Up Control
Only for the pin set to input mode, pull-up is controlled by the
PULL register and the segment output disable register.
Notes on Termination of Unused Pins
1. Termination of Unused Pins
Perform the following at the shortest possible distance (20 mm or
less) from the MCU pins.
(1) I/O ports
Set the ports to input mode and connect each pin to VCC or VSS
through a resistor of 1 k to 10 k
Ω. An internal pull-up resistor can
also be used for the port where the internal pull-up resister is
selectable.
To set the ports to output mode, leave open at “L” or “H” output.
When setting the ports to output mode and leave open,
input mode in the initial state remains until the mode of the
ports are switched to output mode by a program after a
reset. This may cause the voltage level of the pins to be
undefined and the power source current to increase while
the ports remains in input mode. For any effects on the
system, careful system evaluations should be implemented
on the user side.
The direction registers may be changed due to a program
runaway or noise, so reset the registers periodically by a
program to increase the program reliability.
2. Termination Concerns
(1) When setting I/O ports to input mode
[1] Do not leave open
<Reason>
The power source current may increase depending on the
first-stage circuit.
The ports are more likely affected by noise when compared
with the termination shown on the above “1. (1) I/O ports”
[2] Do not connect to VCC or VSS directly
<Reason>
If the direction registers are changed to output mode due to a
program runaway or noise, a short circuit may occur.
[3] Do not connect multiple ports in a lump to VCC or VSS
through a resistor.
<Reason>
If the direction registers are changed to output mode due to a
program runaway or noise, a short circuit may occur between the
ports.
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