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| 型號(hào)： | ST92T163N4B1L |
| 英文描述： | 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS. 20K ROM. 2K RAM. I 2 C. SCI. & MFT |
| 中文描述： | 16位產(chǎn)品全速USB微控制器，16終點(diǎn)復(fù)合設(shè)備。 20,000光盤(pán)。 2K的RAM。余2長(zhǎng)脊髓損傷。 |
| 文件頁(yè)數(shù)： | 66/230頁(yè) |
| 文件大?。?/td> | 2743K |
| 代理商： | ST92T163N4B1L |
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ST92163 - INTERRUPTS
WAKE-UP / INTERRUPT LINES MANAGEMENT UNIT
(Cont’d)
3.12.4 Programming Considerations
The following paragraphs give some guidelines for
designing an application program.
3.12.4.1 Procedure for Entering/Exiting STOP
mode
1. Program the polarity of the trigger event of
external wake-up lines by writing registers
WUTRH and WUTRL.
2. Check that at least one mask bit (registers
WUMRH, WUMRL) is equal to 1 (so at least
one external wake-up line is not masked).
3. Reset at least the unmasked pending bits: this
allows a rising edge to be generated on the
INTD1 channel when the trigger event occurs
(an interrupt on channel INTD1 is recognized
when a rising edge occurs).
4. Select the interrupt source of the INTD1 chan-
nel (see description of ID1S bit in the WUCTRL
register) and set the WKUP-INT bit.
5. To generate an interrupt on channel INTD1, bits
EITR.1 (R242.7, Page 0) and EIMR.1 (R244.7,
Page 0) must be set and bit EIPR.7 must be
reset. Bits 7 and 6 of register R245, Page 0
must be written with the desired priority level for
interrupt channel INTD1.
6. Reset the STOP bit in register WUCTRL and
the EX_STP bit in the CLK_FLAG register
(R242.7, Page 55). Refer to the RCCU chapter.
7. To enter STOP mode, write the sequence 1, 0,
1 to the STOP bit in the WUCTRL register with
three consecutive write operations.
8. The code to be executed just after the STOP
sequence must check the status of the STOP
and RCCU EX_STP bits to determine if the ST9
entered STOP mode or not (See “Wake-up
Mode Selection” on page 64. for details). If the
ST9 did not enter in STOP mode it is necessary
to reloop the procedure from the beginning, oth-
erwise the procedure continues from next point.
9. Poll the wake-up pending bits to determine
which wake-up line caused the exit from STOP
mode.
10.Clear the wake-up pending bit that was set.
3.12.4.2 Simultaneous Setting of Pending Bits
It is possible that several simultaneous events set
different pending bits. In order to accept subse-
quent events on external wake-up/interrupt lines, it
is necessary to clear at least one pending bit: this
operation allows a rising edge to be generated on
the INTD1 line (if there is at least one more pend-
ing bit set and not masked) and so to set EIPR.7
bit again. A further interrupt on channel INTD1 will
be serviced depending on the status of bit EIMR.7.
Two possible situations may arise:
1. The user chooses to reset all pending bits: no
further interrupt requests will be generated on
channel INTD1. In this case the user has to:
– Reset EIMR.7 bit (to avoid generating a spuri-
ous interrupt request during the next reset op-
eration on the WUPRH register)
– Reset WUPRH register using a read-modify-
write instruction (AND, BRES, BAND)
– Clear the EIPR.7 bit
– Reset the WUPRL register using a read-mod-
ify-write instruction (AND, BRES, BAND)
2. The user chooses to keep at least one pending
bit active: at least one additional interrupt
request will be generated on the INTD1 chan-
nel. In this case the user has to reset the
desired pending bits with a read-modify-write
instruction (AND, BRES, BAND). This operation
will generate a rising edge on the INTD1 chan-
nel and the EIPR.7 bit will be set again. An
interrupt on the INTD1 channel will be serviced
depending on the status of EIMR.7 bit.
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| ST92T163R4T1 | 功能描述:8位微控制器 -MCU OTP EPROM 20K USB/I2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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