參數(shù)資料
型號: M38K27M4L-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 149/151頁
文件大?。?/td> 1403K
代理商: M38K27M4L-XXXFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 97 of 147
REJ03B0193-0300
Fig. 144 System clock generating circuit block diagram (single-chip mode)
Fig. 141 Ceramic resonator or quartz-crystal oscilltor circuit
Fig. 142 External clock input circuit
Fig. 143 Structure of MISRG
CIN
COUT
XIN
XOUT
Rd (Note)
Note : Insert a damping resistor if required.
The resistance will vary depending on the oscillator
and the oscillation drive capacity setting.
Use the value recommended by the maker of the
oscillator.
Also, if the oscillator manufacturer's data sheet
specifies that a feedback resistor be added external
to the chip though a feedback resistor exists on-chip,
insert a feedback resistor between XIN and XOUT
following the instruction.
XOUT
External oscillation circuit
Open
VCC
VSS
XIN
MISRG
(MISRG: address 0FFB16)
Oscillation stabilizing time set after STP instruction
released bit
0: Automatically set “0116” to Timer 1,
“FF16” to Prescaler 12
1: Automatically set nothing
Not used (indefinite at read)
b0
b7
Reset
PLL
1/8
1/4
1/6
fUSB
XIN
XOUT
fsio
fAD
1/8
1/4
1/2
1/1
S
R
Q
S
R
Q
S
R
Q
1/2
FF16
0116
1/2
fvco
fSYN
USB clock selection bit
USB clock division
ration selection bits
System clock division
ration selection bits
Timer 1
Prescaler 12
Reset or STP
instruction
Timing
φ (internal clock)
STP instruction
WIT
instruction
STP instruction
Reset
Interrupt request
Interrupt disable flag l
System clock selection bit
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