參數(shù)資料
型號: MC68HC916X1
廠商: Motorola, Inc.
英文描述: 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述: 16位微控制器模塊(16位模塊化微控制器)
文件頁數(shù): 21/172頁
文件大?。?/td> 1035K
代理商: MC68HC916X1
MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
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 f
ref
, and can be either a crystal or an external clock source. The
output of the clock system is referred to as f
sys
. Ensure that f
ref
and f
sys
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
Y
X
EXTAL
XTAL
XFC
V
DDSYN
CLKOUT
÷
128
f
VCO
16 OSCILLATOR 4M
EXTAL
XTAL
1 M
1.5 K
27 pF*
27 pF*
V
SSI
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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