参数资料
型号: MC9S12C32PVFA16
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP48
封装: PLASTIC, LQFP-48
文件页数: 112/116页
文件大小: 1882K
代理商: MC9S12C32PVFA16
Device User Guide — 9S12C32DGV1/D V01.14
B.6 Reset, Oscillator and PLL
This section summarizes the electrical characteristics of the various startup scenarios for Oscillator and
Phase-Locked-Loop (PLL).
B.6.1 Startup
Table B-10 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 User Guide.
B.6.1.1 SRAM Data Retention
Provided an appropriate external reset signal is applied to the MCU, preventing the CPU from executing
code when VDD5 is out of specification limits, the SRAM contents integrity is guaranteed if after the reset
the PORF bit in the CRG Flags Register has not been set.
B.6.1.2 External Reset
When external reset is asserted for a time greater than PWRSTL 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.
B.6.1.3 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.
B.6.1.4 Pseudo Stop and Wait Recovery
The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in
both modes. The controller can be woken up by internal or external interrupts. After twrs the CPU starts
fetching the interrupt vector.
Table B-10 Startup Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num
C
Rating
Symbol
Min
Typ
Max
Unit
1
T
POR release level
VPORR
2.07
V
2
T
POR assert level
VPORA
0.97
V
3
D
Reset input pulse width, minimum input time
PWRSTL
2
tosc
4
D
Startup from Reset
nRST
192
196
nosc
5D
Interrupt pulse width, IRQ edge-sensitive
mode
PWIRQ
20
ns
6
D
Wait recovery startup time
tWRS
14
tcyc
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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