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參數(shù)資料
| 型號： | M38837G6HP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 53/81頁 |
| 文件大?。?/td> | 766K |
| 代理商： | M38837G6HP |
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Rev.1.00
Oct 26, 2004
page 57 of 79
3883 Group
Operation of Serialized IRQ
A cycle operation of serialized IRQ starts with Start Frame and fin-
ishes with Stop Frame. There are two modes of operation :
Continuous (Idle) mode and Quiet (Active) mode. The next opera-
tion mode is determined by monitoring the stop frame pulse width.
qTiming of serialized IRQ cycle
Figure 54 shows the timing diagram of serialized IRQ cycle.
(1) Start Frame
The Start Frame is detected when the SERIRQ line remains “L” in
4 to 8 clocks.
Fig. 54 Timing diagram of serialized IRQ cycle
(2) IRQ/Data Frame
Each IRQ/Data Frame is three clocks. When the IRQi (i = 0, 1, x)
request is “0”, then the SERIRQ line is driven to “L” during the
Sample phase (1st clock) of the corresponding IRQ/Data frame,
to “H” during the Recovery phase (2nd clock), to 3-state during
the Turn-around phase (3rd clock). When the IRQi request is “1”,
then the SERIRQ line is 3-state in all phases (3 clocks period).
(3) Stop Frame
The Stop Frame is detected when the SERIRQ line remains “L” in
2 or 3 clocks. The next operation mode is Quiet mode when the
pulse width of “L” is 2 clocks. The next operation mode is the
Continuous mode when the pulse width is 3 clocks.
Start frame
IRQ0 frame
IRQ1 frame
IRQ15 frame
IOCHK frame
IRQ1
device
control
Stop frame
To the next cycle
IRQ15
device
control
Host control
Clock
SERIRQ
Driver source
Host control
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