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| 型號： | ST7FLCD1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-bit MCU for LCD Monitors with 60 KBytes Flash, 2 KBytes RAM, 2 DDC Ports and Infrared Controller |
| 中文描述： | 8位微控制器的液晶顯示器為60千字節(jié)閃存，2千字節(jié)RAM，2個DDC的港口和紅外線控制器 |
| 文件頁數(shù)： | 24/95頁 |
| 文件大?。?/td> | 633K |
| 代理商： | ST7FLCD1 |
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Interrupts
ST7FLCD1
24/95
4
Interrupts
There are two different methods to interrupt the ST7:
1. a maskable hardware interrupt as listed in
Table 7
2. a non-maskable software interrupt (TRAP).
The Interrupt Processing flowchart is shown in
Figure 10
.
Only enabled maskable interrupts are serviced. However, disabled interrupts are latched and
processed. For an interrupt to be serviced, the PC, X, A and CC registers are saved onto the stack,
the interrupt mask (bit I of the Condition Code Register) is set to prevent additional interrupts. The Y
register is not automatically saved.
The PC is then loaded with the interrupt vector and the interrupt service routine runs (refer to
Table 7
for vector addresses) and ends with the IRET instruction. At the IRET instruction, the
contents of the registers are recovered from the stack and normal processing resumes. Note that
the I bit is then cleared if the corresponding bit stored in the stack is zero.
Though many interrupts can be run simultaneously, an order of priority is defined (see
Table 7
). The
RESET pin has the highest priority. If the I bit is set, only the TRAP interrupt is enabled. All
interrupts allow the processor to exit the WAIT Low Power mode.
4.1
Software
The software interrupt is the executable TRAP instruction. The interrupt is recognized when the
TRAP instruction is executed, regardless of the state of the I bit. When an interrupt is recognized, it
is serviced according to flowchart described in
Figure 10
.
Note:
During ICC communication, the TRAP interrupt is reserved.
4.2
External Interrupts (ITA, ITB)
The ITA (PA6), ITB (PA7) pins generate an interrupt when a falling or rising edge occurs on these
pins. These interrupts are enabled by the ITAITE and ITBITE bits (respectively) in the ITRFRE
register, provided that the I bit from the CC register is reset. Each external interrupt has its own
interrupt vector.
4.3
Peripheral Interrupts
The various peripheral devices with interrupts include both Display Data Channels (DDC A and
DDC B), the Infrared Controller (IFR), two 8-bit timers (Timer A and Timer B) and the I2C interface.
Different peripheral interrupt flags fetch an interrupt if the I bit from the CC register is reset and the
corresponding Enable bit is set. If any of these conditions is not fulfilled, the interrupt is latched but
not serviced, thus remaining pending.
4.4
Processing
Interrupt flags are located in the status register. The Enable bits are in the control register. When an
enabled interrupt occurs, normal processing is suspended at the end of the current instruction
execution. It is then serviced according to the flowchart shown in
Figure 10
.
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST7FLCD1_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller |
| ST7FLI15BF1U6 | 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| ST7FLI15BF1U6TR | 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| ST7FLI19BF1M3TR | 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| ST7FLI19BF1U6TR | 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash 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 最大時鐘頻率:50 MHz 程序存儲器大小: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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