參數(shù)資料
型號: M38857M8-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù): 77/105頁
文件大小: 1403K
代理商: M38857M8-XXXHP
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
70
Fig. 70 System clock generating circuit block diagram (Single-chip mode)
WIT instruction
STP instruction
Timing
φ (internal clock)
S
R
Q
STP instruction
S
R
Q
Main clock stop bit
S
R
Q
1/2
1/4
XIN
XOUT
XCOUT
XCIN
Interrupt request
Reset
Interrupt disable flag l
1/2
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 (Note 1)
Notes 1: 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. When exciting STP instruction, the count source
does not change either f(XIN))/16 or f(XCIN))/16 after releasing stop mode. Oscillation stabilizing time is not fixed “01FF16
when the bit 6 of PCTL2 is “1”.
Main clock division ratio
selection bits (Note1)
FF16
0116
Prescaler 12
Timer 1
Reset or
STP instruction
(Note 2)
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