參數(shù)資料
型號： M37512FCH-XXXHP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù)： 52/87頁
文件大?。?/td> 879K
代理商： M37512FCH-XXXHP
Feb 18, 2005
page 56 of 85
REJ03B0122-0101
7512 Group
Fig. 65 System clock generating circuit block diagram (Single-chip mode)
WIT instruction
STP instruction
S
R
Q
S
R
QS
R
Q
XCOUT
XCIN
Interrupt request
Reset
Interrupt disable flag l
1/2
1/4
1/2
Port XC switch bit
“1”
“0”
XIN
XOUT
High-speed or
middle-speed
mode
Main clock division ratio
selection bit (Note 1)
Note 1: Any one of high-speed mode, middle-speed mode 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 (b1) to “1”.
2: When the oscillation stabilizing time set after STP instruction release bit is “0”.
3: Although a feed-back resistor exists on-chip, an external feed-back resistor may be needed depending on conditions.
Timing
φ
(Internal clock)
Main clock stop bit
(XIN-XOUT)
High-speed or
low-speed mode
Main clock division ratio
selection bits (Note 1)
FF16
0116
Prescaler 12
Timer 1
Reset or
STP instruction
(Note 2)
Middle-speed mode
Low-speed mode
High-speed RC oscillation stop bit
XIN changing inhibit bit
Port XC switch bit
Clock source
switch bit
Data bus
32kHZ RC oscillation enable bit
1/2
High-speed RC
oscillation circuit
XIN-XOUT oscillation
High-speed
RC oscillation
32kHZ RC oscillation enable bit
32kHZ oscillation circuit
control register 0, 1
(Note 3)
XCIN-XOUT
oscillation
32kHZ RC oscillation
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