參數(shù)資料
型號： MAC7121VAG40
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP112
封裝： 20 X 20 MM, 0.65 MM PITCH, ROHS COMPLIANT, LQFP-112
文件頁數(shù)： 7/56頁
文件大?。?/td> 1216K
代理商： MAC7121VAG40
ElectricalCharacteristics
MAC7100 Microcontroller Family Hardware Specifications, Rev. 1.2
Preliminary
Freescale Semiconductor
15
3.8
Clock and Reset Generator
This section describes the electrical characteristics for the oscillator, phase-locked loop, clock monitor and
reset generator.
3.8.1
Oscillator Characteristics
The MAC7100 Family features an internal low power loop controlled Pierce oscillator and a full swing
Pierce oscillator/external clock mode. The selection of loop controlled Pierce oscillator or full swing
Pierce oscillator/external clock depends on the level of the XCLKS signal at the rising edge of the RESET
signal. Before asserting the oscillator to the internal system clock distribution subsystem, the quality of the
oscillation is checked for each start from either power on, STOP or oscillator fail. tCQOUT specifies the
maximum time before switching to the internal self clock mode after POR or STOP if a proper oscillation
is not detected. The quality check also determines the minimum oscillator start-up time tUPOSC. The device
also features a clock monitor. A Clock Monitor Failure is asserted if the frequency of the incoming clock
signal is below the Clock Monitor Assert Frequency fCMFA.
Table 19. Oscillator Characteristics
Num C
Rating
Symbol
Min
Typ
Max
Unit
J1a
C Crystal oscillator range (loop controlled Pierce)
fOSC
1
NOTES:
1. If CLKSEL[PLLSEL] is clear then the system clock (fSYS) is equal to fOSC, otherwise it is equal to fVCO (table
Table 20, K3). Throughout this document, tSYS is used to specify a unit of time equal to 1 ÷ fSYS.
4.0
—
16
MHz
J1b
C Crystal oscillator range (full swing Pierce) 2 3
2. Depending on the crystal; a damping series resistor might be necessary
3. XCLKS asserted (low) during reset
0.5
—
40
MHz
J2
P Startup Current
IOSC
100
—
μA
J3
C Oscillator start-up time (loop controlled Pierce)
tUPOSC
—3 4
4. fOSC = 4 MHz, C = 22 pF (refer to the MAC7100 Microcontroller Family Reference Manual (MAC7100RM) for circuit
board layout recommendations, including oscillator capacitor placement and values).
50 5
5. Maximum value is for extreme cases using high Q, low frequency crystals
ms
J4
D Clock Quality check time-out
tCQOUT
0.45
—
2.5
s
J5
P Clock Monitor Failure Assert Frequency
fCMFA
50
100
200
KHz
J6
P External square wave input frequency 3
fEXT
0.5
—
50
MHz
J7
D External square wave pulse width low
tEXTL
9.5
—
ns
J8
D External square wave pulse width high
tEXTH
9.5
—
ns
J9
D External square wave rise time
tEXTR
——
1
ns
J10
D External square wave fall time
tEXTF
——
1
ns
J11
D Input Capacitance (EXTAL, XTAL pins)
CIN
—7
—
pF
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