參數(shù)資料
型號: M38037M8H-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 81/117頁
文件大?。?/td> 1873K
代理商: M38037M8H-XXXHP
Rev.3.11
Apr 5, 2006
Page 66 of 113
REJ03B0017-0311
3803 Group (Spec.H)
Fig 62. System clock generating circuit block diagram (Single-chip mode)
WIT
instruction
STP
instruction
Timing
φ (internal clock)
S
R
Q
S
R
Q
Main clock stop bit
S
R
Q
1/2
1/4
XIN
XOUT
XCOUT
XCIN
Interrupt request
Interrupt disable flag l
Reset
Port XC
switch bit
“1”
“0”
Low-speed
mode
High-speed or
middle-speed mode
Middle-speed mode
High-speed or
low-speed mode
Main clock division ratio
selection bits(1)
Main clock division ratio
selection bits(1)
Notes1: Either high-speed, middle-speed or low-speed mode is selected by bits 7 and 6 of the CPU mode register.
When low-speed mode is selected, set port XC switch bit (b4) to “1”.
2:f(XIN)/16 is supplied as the count source to the prescaler 12 at reset, the count source before executing the STP instruction is
supplied as the count source at executing STP instruction.
3: When bit 0 of MISRG is “0”, timer 1 is set “0116” and prescaler 12 is set “FF16” automatically. When bit 0 of MISRG is “1” , set the
appropriate value to them in accordance with oscillation stabilizing time required by the using oscillator because nothing is
automatically set into timer 1 and prescaler 12.
4: Although a feed-back resistor exists on-chip, an external feed-back resistor may be needed depending on conditions.
Prescaler 12
Timer 1
Reset or
STP instruction(2)
Reset
(3)
(4)
STP
instruction
Divider
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