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| 型號(hào)： | SDA5254-2 |
| 廠商： | SIEMENS A G |
| 元件分類： | 圖文 |
| 英文描述： | ICs for Consumer Electronics |
| 中文描述： | TELETEXT DECODER, PDIP52 |
| 文件頁(yè)數(shù)： | 72/143頁(yè) |
| 文件大?。?/td> | 1050K |
| 代理商： | SDA5254-2 |
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SDA 525x
Semiconductor Group
72
1998-04-08
6.3.4.2
The external interrupt request inputs (INT0 and INT1) can be programmed for either
transition- activated or level-activated operation. Control of the external interrupts is
provided by the four low- order bits of TCON as shown in the follow section.
When IT0 and IT1 are set to one, interrupt requests on INT0 and INT1 are transition-
activated (high-to-low), else they are low-level activated. IE0 and IE1 are the interrupt
request flags. These flags are set when their corresponding interrupt request inputs at
INT0 and INT1, respectively, are low when sampled by the processor and the transition-
activated scheme is selected by IT0 and IT1.
External Interrupts
Function of Lower Nibble Bits in TCON
Timer and Interrupt Control
Register
Default after reset: 00
H
(MSB)
TF1
TR1
TCON
SFR-Address 88
H
(LSB)
IT0
TF0
TR0
IE1
IT1
IE0
TCON.4 – TCON.7
See
Chapter “General Purpose Timers/Counters” on
page 80
.
IE1
Interrupt 1 edge flag. Set by hardware when external interrupt
edge detected. Cleared when interrupt processed.
IT1
Interrupt 1 type control bit. Set/cleared by software to specify
falling edge/low level triggered external interrupts. IT1 = 1
selects transition-activated external interrupts.
IE0
Interrupt 0 edge flag. Set by hardware when external interrupt
edge detected. Cleared when interrupt processed.
IT0
Interrupt 0 type control bit. Set/cleared by software to specify
falling edge/low level triggered external interrupts. IT0 = 1
selects transition-activated external interrupts.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SDA 5251 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA 5252 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA 5254 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA5254M | ICs for Consumer Electronics |
| SDA525X | ICs for Consumer Electronics |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SDA5254M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5254M-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
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