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參數(shù)資料
| 型號(hào)： | M38007M1-XXXSP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Output LDO, 800mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection 4-SOT-223 -40 to 125 |
| 中文描述： | 8位單片機(jī) |
| 文件頁數(shù)： | 120/173頁 |
| 文件大?。?/td> | 4203K |
| 代理商： | M38007M1-XXXSP |
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3800 GROUP USER’S MANUAL
3-18
APPENDIX
3.3 Notes on use
(1) Sequence for switching an external interrupt
detection edge
When the external interrupt detection edge must be
switched, make sure the following sequence.
Clear an interrupt enable bit to “0” (interrupt disabled)
Switch the detection edge
Clear an interrupt request bit to “0” (no interrupt requ-
est issued)
Set the interrupt enable bit to “1” ( interrupt enabled )
3.3 Notes on use
3.3.1 Notes on interrupts
Reason
The interrupt circuit recognizes the switching of the
detection edge as the change of external input
signals. This may cause an unnecessary interrupt.
(2) Bits 7 and 6 of the interrupt control register 2
Fix the bits 7 and 6 of the interrupt control register 2
(Address:003F
16
) to “0”.
Figure 3.3.1 shows the structure of the interrupt
control register 2.
Fig. 3.3.1 Structure of interrupt control register 2
3.3.2 Notes on the serial I/O
(1) Stop of data transmission
As for the serial I/O that can be used as either a clock synchronous or an asynchronous (UART) serial I/O, clear
the transmit enable bit to “0” (transmit disabled), and clear the serial I/O enable bit to “0” (serial I/O disabled)in the
following cases :
G
when stopping data transmission during transmitting data in the clock synchronous serial I/O mode
G
when stopping data transmission during transmitting data in the UART mode
G
when stopping only data transmission during transmitting and receiving data in the UART mode
Reason
Since transmission is not stopped and the transmission circuit is not initialized even if the serial I/O enable bit is
cleared to “0” (serial I/O disabled), the internal transmission is running (in this case, since pins TxD, RxD, S
CLK
,
and S
RDY
function as I/O ports, the transmission data is not output). When data is written to the transmit buffer
register in this state, the data is transferred to the transmit shift register and start tp be sjifted. When the serial
I/O enable bit is set to “1” at this time, the data during internally shifting is output to the TxD pin and ti may cause
an operation failure to a microcomputer.
(2) Stop of data reception
As for the serial I/O that can be used as either a clock synchronous or an asynchronous (UART) serial I/O, clear
the receive enable bit to “0” (receive disabled), or clear the serial I/O enable bit to “0” (serial I/O disabled) in the
following case :
G
when stopping data reception during receiving data in the clock synchronous serial I/O mode
Clear the receive enable bit to “0” (receive disabled) in the following cases :
G
when stopping data reception during receiving data in the UART mode
G
when stopping only data reception during transmitting and receiving data in the UART mode
b7
0 0
b0
Interrupt control register 2
Address 003F
16
Interrupt enable bits
Not used
Fix these bits to “0”.
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