參數(shù)資料
型號(hào): M38827G5-XXXHP
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): 41/64頁
文件大?。?/td> 619K
代理商: M38827G5-XXXHP
Rev.1.01
Nov 14, 2005
page 44 of 60
REJ03B0089-0101
3882 Group
Clock Restart/Stop Inhibition Request
Asserting the CLKRUN signal can request the host to restart for
clocks stopped or slowed down, or maintain the clock tending to
stop or slow down.
Figure 37 shows the timing diagram of clock restart request; Fig-
ure 38 shows an example of timing of clock stop inhibition
request.
Fig. 37 Timing diagram of clock restart request
Fig. 38 Timing diagram of clock stop inhibition request
(2) Clock stop inhibition request
In case the LPC clock stop inhibition bit (bit 2 of SERCON) is “1”
and the serialized interrupt request is held, if the LCLK tends to
stop, the 3882 drives CLKRUN to “L” for requesting the PCI clock
generator not to stop LCLK.
(1) Clock restart operation
In case the LPC clock restart enable bit (bit 1 of SERCON) is “1”
and the CLKRUN (BUS) is “H”, when the serialized interrupt re-
quest occurs, the 3882 drives CLKRUN to “L” for requesting the
PCI clock generator to restart the LCLK if the clock is slowed
down or stopped.
LCLK
Bus CLKRUN
Central Resource CLKRUN
3882 CLKRUN
Interrupt request
Internal inhibition request signal
Bus SERIRQ
IRQSER cycle
Inhibition
request
LCLK
Bus CLKRUN
Central Resource CLKRUN
3882 CLKRUN
Bus SERIRQ
Host SERIRQ
3882 SERIRQ
Interrupt request
Internal restart
request signal
φ
Start frame
Restart frame
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