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参数资料
| 型号： | M38503M2-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| 封装： | 0.450 INCH, 0.80 MM, PLASTIC, SSOP-42 |
| 文件页数： | 25/55页 |
| 文件大小： | 867K |
| 代理商： | M38503M2-XXXFP |
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28
3850 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 35 System clock generating circuit block diagram (Single-chip mode)
MISRG
(MISRG : address 003816)
Oscillation stabilizing time set after STP instruction
released bit
Middle-speed mode automatic switch set bit
Middle-speed mode automatic switch wait time set bit
Middle-speed mode automatic switch start bit
(Depending on program)
Not used (return “0” when read)
b7
b0
0: Automatically set “0116” to Timer 1,
“FF16” to Prescaler 12
1: Automatically set nothing
0: Not set automatically
1: Automatic switching enable
0: 4.5 to 5.5 machine cycles
1: 6.5 to 7.5 machine cycles
0: Invalid
1: Automatic switch start
Fig. 34 Structure of MISRG
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)
Note: Any one of 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 (b1) to “1”.
Main clock division ratio
selection bits (Note)
FF16
0116
Prescaler 12
Timer 1
Reset or
STP instruction
Middle-speed mode automatic switch set bit
By setting the middle-speed mode automatic switch set bit to “1”
while operating in the low-speed mode, XIN oscillation automati-
cally starts and the mode is automatically switched to the
middle-speed mode when defecting a rising/falling edge of the
SCL or SDA pin. The middle-speed automatic switch wait time set
bit can select the switch timing from the low-speed to the middle-
speed mode; either 4.5 to 5.5 machine cycles or 6.5 to 7.5
machine cycles in the low-speed mode. Select it according to os-
cillation start characteristics of used XIN oscillator.
The middle-speed mode automatic switch start bit is used to auto-
matically make to XIN oscillation start and switch to the
middle-speed mode by setting this bit to “1” while operating in the
low-speed mode.
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相关代理商/技术参数 |
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