參數(shù)資料
型號： MC9S12UF32
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： System on a Chip Guide V01.05
中文描述： 片上系統(tǒng)指南V01.05
文件頁數(shù)： 105/124頁
文件大?。?/td> 2125K
代理商： MC9S12UF32
105
A.5 Reset, Oscillator and PLL
This section summarizes the electrical characteristics of the various startup scenarios for Oscillator and
Phase-Locked-Loop (PLL).
A.5.1 Startup
Table A-14
summarizes several startup characteristics explained in this section. Detailed description of
the startup behavior can be found in the Clock and Reset Generator (CRG) Block Guide.
Table A-14 Startup Characteristics
A.5.1.1 POR
The release level V
PORR
and the assert level V
PORA
are derived from the V
DD
Supply. They are also valid
ifthedeviceispoweredexternally.AfterreleasingthePORresettheoscillatorandtheclockqualitycheck
are started. If after a time t
CQOUT
no valid oscillation is detected, the MCU will start using the internal self
clock. The fastest startup time possible is given by n
uposc
.
A.5.1.2 SRAM Data Retention
Provided an appropriate external reset signal is applied to the MCU, preventing the CPU from executing
codewhenVDD5isoutofspecificationlimits,theSRAMcontentsintegrityisguaranteedifafterthereset
the PORF bit in the CRG Flags Register has not been set.
A.5.1.3 External Reset
When external reset is asserted for a time greater than PW
RSTL
the CRG module generates an internal
reset, and the CPU starts fetching the reset vector without doing a clock quality check, if there was an
oscillation before reset.
A.5.1.4 Stop Recovery
Out of STOP the controller can be woken up by an external interrupt. A clock quality check as after POR
is performed before releasing the clocks to the system.
Conditions are shown in
Table A-4
unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
T POR release level
V
PORR
-
-
2.07
V
2
T POR assert level
V
PORA
0.97
-
-
V
3
D Reset input pulse width, minimum input time
PW
RSTL
2
-
-
t
osc
4
D Startup from Reset
n
RST
192
-
196
n
osc
5
D Interrupt pulse width, IRQ edge-sensitive mode
PW
IRQ
20
-
-
ns
6
D Wait recovery startup time
t
WRS
-
-
14
t
cyc
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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