- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄195888 > ST72254G1M6 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. PDF資料下載
參數(shù)資料
| 型號(hào)： | ST72254G1M6 |
| 英文描述： | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| 中文描述： | 8位單電壓閃存微控制器。 ADC的。 16位定時(shí)器。的SPI。 |
| 文件頁(yè)數(shù)： | 59/140頁(yè) |
| 文件大?。?/td> | 1349K |
| 代理商： | ST72254G1M6 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)當(dāng)前第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)
ST72104G, ST72215G, ST72216G, ST72254G
25/140
8 INTERRUPTS
The ST7 core may be interrupted by one of two dif-
ferent methods: maskable hardware interrupts as
listed in the Interrupt Mapping Table and a non-
maskable software interrupt (TRAP). The Interrupt
processing flowchart is shown in Figure 1.
The maskable interrupts must be enabled clearing
the I bit in order to be serviced. However, disabled
interrupts may be latched and processed when
they are enabled (see external interrupts subsec-
tion).
When an interrupt has to be serviced:
– Normal processing is suspended at the end of
the current instruction execution.
– The PC, X, A and CC registers are saved onto
the stack.
– The I bit of the CC register is set to prevent addi-
tional interrupts.
– The PC is then loaded with the interrupt vector of
the interrupt to service and the first instruction of
the interrupt service routine is fetched (refer to
the Interrupt Mapping Table for vector address-
es).
The interrupt service routine should finish with the
IRET instruction which causes the contents of the
saved registers to be recovered from the stack.
Note: As a consequence of the IRET instruction,
the I bit will be cleared and the main program will
resume.
Priority Management
By default, a servicing interrupt cannot be inter-
rupted because the I bit is set by hardware enter-
ing in interrupt routine.
In the case when several interrupts are simultane-
ously pending, an hardware priority defines which
one will be serviced first (see the Interrupt Map-
ping Table).
Interrupts and Low Power Mode
All interrupts allow the processor to leave the
WAIT low power mode. Only external and specifi-
cally mentioned interrupts allow the processor to
leave the HALT low power mode (refer to the “Exit
from HALT“ column in the Interrupt Mapping Ta-
ble).
8.1 NON MASKABLE SOFTWARE INTERRUPT
This interrupt is entered when the TRAP instruc-
tion is executed regardless of the state of the I bit.
It will be serviced according to the flowchart on
Figure 1.
8.2 EXTERNAL INTERRUPTS
External interrupt vectors can be loaded into the
PC register if the corresponding external interrupt
occurred and if the I bit is cleared. These interrupts
allow the processor to leave the Halt low power
mode.
The external interrupt polarity is selected through
the miscellaneous register or interrupt register (if
available).
An external interrupt triggered on edge will be
latched and the interrupt request automatically
cleared upon entering the interrupt service routine.
If several input pins, connected to the same inter-
rupt vector, are configured as interrupts, their sig-
nals are logically ANDed before entering the edge/
level detection block.
Caution: The type of sensitivity defined in the Mis-
cellaneous or Interrupt register (if available) ap-
plies to the ei source. In case of an ANDed source
(as described on the I/O ports section), a low level
on an I/O pin configured as input with interrupt,
masks the interrupt request even in case of rising-
edge sensitivity.
8.3 PERIPHERAL INTERRUPTS
Different peripheral interrupt flags in the status
register are able to cause an interrupt when they
are active if both:
– The I bit of the CC register is cleared.
– The corresponding enable bit is set in the control
register.
If any of these two conditions is false, the interrupt
is latched and thus remains pending.
Clearing an interrupt request is done by:
– Writing “0” to the corresponding bit in the status
register or
– Access to the status register while the flag is set
followed by a read or write of an associated reg-
ister.
Note: the clearing sequence resets the internal
latch. A pending interrupt (i.e. waiting for being en-
abled) will therefore be lost if the clear sequence is
executed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72254G1M5 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| ST72254G1M3 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| ST72254G1M1 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| ST72254G1B7 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| ST72254G1B6 | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72254G1M6/XXX | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES |
| ST72254G1M7 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
| ST72254G1M7/XXX | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES |
| ST72254G2 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES |
| ST72254G2B1 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI. |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。