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32186 Datasheet(PDF) 555 Page - Renesas Technology Corp

Part # 32186
Description  MCU
PDF  1032 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

32186 Datasheet(HTML) 555 Page - Renesas Technology Corp

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SERIAL INTERFACE
12
12-7
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
Figure 12.2.2 Example for Clearing Interrupt Request Status
b4
5
b7
Interrupt request status
Initial state
Bit 6 event occurs
Interrupt request
Bit 4 event occurs
Only bit 6 cleared
Bit 4 data retained
b4
5
b7
1
1
0
1
Write to the interrupt request status
Example for clearing interrupt request status
0
0
0
0
0
0
1
0
1
0
1
0
1
0
0
0
Program example
ISTREG = 0xfd;
/* Clear ISTAT1 (0x02 bit) only */
• To clear the Interrupt Request Status Register 0 (ISTREG) interrupt request status 1: ISTAT1 (0x02 bit)
To clear an interrupt request status, always be sure to write 1 to all other interrupt request status bits. At this time,
avoid using a logic operation like the one shown below. Because it requires three step-ISTREG read, logic operation
and write, if another interrupt request occurs between the read and write, status may be inadvertently cleared.
b4
5
6
b7
Interrupt request status
Bit 6 event occurs
Bit 4 event occurs
Only bit 6 cleared
Bit 4 also cleared
0
0
1
0
1
0
1
0
0
0
0
0
Read
0
0
1
0
0
0
0
0
Clear bit 6 (ANDing with 1101)
Write
6
6
ISTREG &= 0xfd;
/* Clear ISTAT1 (0x02 bit) only */
12.2 Serial Interface Related Registers



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