參數(shù)資料
型號(hào): LH79531
英文描述: ARM RISC CORE ASSPs ARM7TDMI
中文描述: ARM的RISC核心專用標(biāo)準(zhǔn)的ARM7TDMI
文件頁數(shù): 33/39頁
文件大?。?/td> 296K
代理商: LH79531
System-on-Chip
LH79520
Preliminary Data Sheet
8/21/02
33
Reset, Clock, and Power Controller
(RCPC) Waveforms
Figure 20 shows the method the LH79520 uses
when coming out of Reset or Power On.
Figure 21 shows external reset timing, and Table 8
gives the timing parameters.
NOTE:
Values in this table are from characterization.
Table 8. Reset AC Timing
PARAMETER
tOSC (32 kHz)
tOSC (14 MHz)
tRSTIW
DESCRIPTION
MIN.
TYP.
MAX.
550
2.5
UNIT
ms
ms
HCLK
Oscillator stabilization time after Power Up (VDDC = VDDCMIN)
Oscillator stabilization time after Power Up (VDDC = VDDCMIN)
nRESETIN Pulse Width (once sampled LOW)
nRESETIN LOW to nRESETOUT valid
(once nRESETIN sampled LOW)
nRESETOUT hold relative to nRESETIN HIGH
2
tRSTOV
3.5
HCLK
tRSTOH
1
HCLK
Figure 20. PLL Start-up
Figure 21. External Reset
79520-37
tOSC
tRSTOH
VDDC
XTAL
nRESETI
nRESETO
VDDCmin
79520-60
tRSTIW
tRSTOV
nRESETIN
nRESETO
tRSTOH
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