參數(shù)資料
型號: MC68HC916X1CTH16
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP120
封裝: QFP-120
文件頁數(shù): 87/172頁
文件大小: 1200K
代理商: MC68HC916X1CTH16
MC68HC916X1
MOTOROLA
MC68HC916X1TS/D
21
Figure 5 System Clock Block Diagram
3.3.1 Clock Sources
The state of the clock mode (MODCLK) pin during reset determines the system clock source. When
MODCLK is held high during reset, the clock synthesizer generates a clock signal from an external
reference frequency. The clock synthesizer control register (SYNCR) determines operating fre-
quency and mode of operation. When MODCLK is held low during reset, the clock synthesizer is
disabled and an external system clock signal must be driven onto the EXTAL pin.
The input clock is referred to as fref, and can be either a crystal or an external clock source. The
output of the clock system is referred to as fsys. Ensure that fref and fsys are within normal operating
limits.
To generate a reference frequency using the internal oscillator, a reference crystal must be con-
nected between the EXTAL and XTAL pins. Typically, a 4.194 MHz crystal is used, but the frequen-
cy may vary between 1 and 6 MHz. Figure 6 shows a recommended circuit.
Figure 6 System Clock Oscillator Circuit
16/32 PLL BLOCK 4M
PHASE
COMPARATOR
LOW-PASS
FILTER
VCO
CRYSTAL
OSCILLATOR
SYSTEM
CLOCK
SYSTEM CLOCK CONTROL
FEEDBACK DIVIDER
W
X
Y
EXTAL XTAL
XFC
VDDSYN
CLKOUT
÷
128
fVCO
16 OSCILLATOR 4M
EXTAL
XTAL
1 M
1.5 K
27 pF*
VSSI
RESISTANCE AND CAPACITANCE BASED ON A TEST CIRCUIT CONSTRUCTED WITH A KDS041-18 4.194 MHz CRYSTAL.
SPECIFIC COMPONENTS MUST BE BASED ON CRYSTAL TYPE. CONTACT CRYSTAL VENDOR FOR EXACT CIRCUIT.
*
R1
C1
C2
R2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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