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參數(shù)資料
| 型號(hào)： | M3826AMFA-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 75/95頁 |
| 文件大?。?/td> | 1006K |
| 代理商： | M3826AMFA-XXXFP |
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Rev.2.00
May. 24, 2006
page 75 of 90
REJ03B0028-0200
3826 Group (A version)
3.3.2 Notes on I/O port
(1)
Modifying output data with bit managing instruction
When the port latch of an I/O port is modified with the bit managing instruction (Note), the value
of the unspecified bit may be changed.
● Reason
I/O ports can be set to input or output mode in a bit unit. When reading or writing are performed
to the port Pi (i = 0–7) register, the microcomputer operates as follows.
Port in input mode
-Read-access: reads pin’s level (The contents of port latch and pin’s level are unrelated.)
-Write-access: writes data to port latch (The contents of port latch and pin’s level are unrelated.)
Port in output mode
-Read-access: reads port latch (The contents of port latch and pin’s level are unrelated.)
-Write-access: writes data to port latch (The contents of port latch are output from the pin.)
The bit managing instructions are read-modify-write form instructions (refer to “3.3.1 Notes on
programming (6)”) for reading and writing data by a byte unit.
Therefore, when the bit managing instructions are executed to the port set to input mode, the
instruction read the pin’s states, modify the specification bit, and then write data to the port latch.
At this time, if the contents of the original port latch are different from the pins’s level, the contents
of the port latch of bit which is not specified by instruction will change.
In addition to this, if the bit managing instructions are executed to the port Pi register in order to
setting output data when port Pi is configured as a mixed input and output port, the contents of
the port latch of bit in the input mode which is not specified by instruction may change.
Note: Bit managing instructions: SEB instruction, CLB instruction
(2)
The port direction registers are write-only registers. Therefore, the following instructions cannot be
used to this register:
LDA instruction
Memory operation instruction when T flag is “1”
Instructions operating in addressing mode that modifies direction register
Bit test instructions such as BBC and BBS
Bit modification instructions such as CLB and SEB
Arithmetic instructions using read-modify-write form instructions such as ROR
The LDM, STA instructions etc. are used for setting of the direction register.
(3)
Pull-up Operation
When using each port which built in pull-up resistor as an output port, the pull-up control bit of
corresponding port becomes invalid, and pull-up resistor is not connected.
● Reason
Pull-up control is effective only when each direction register is set to the input mode.
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