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参数资料
| 型号： | M38B79FFFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 4.2 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件页数： | 87/112页 |
| 文件大小： | 1862K |
| 代理商： | M38B79FFFP |
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
73
CM4 : Port Xc switch bit
0: I/O port function
1: XCIN-XCOUT oscillating function
CM5 : Main clock (XIN- XOUT) stop bit
0: Oscillating
1: Stopped
CM6: Main clock division ratio selection bit
0: f(XIN) (High-speed mode)
1: f(XIN)/4 (Middle-speed mode)
CM7: Internal system clock selection bit
0: XIN–XOUT selected (Middle-/High-speed mode)
1: XCIN–XCOUT selected (Low-speed mode)
Reset
C
M
4
C
M
7
C
M
4
C
M
5
CM6
CPU mode register
(CPUM : address 003B16)
b7
b4
C
M
7
C
M
5
CM6
“0”
“1”
“0
”
“1
”
“0
”
“1
”
“0
”
“1
”
“0
”
“1
”
“0
”
“1
”
“0
”
“1
”
“0”
“1”
“0”
“1”
“0”
“1”
C
M
4
“1
”
“0
”
C
M
4
“0
”
“1
”
“0
”
“1
”
C
M
5
“1
”
“0
”
“0
”
“1
”
C
M
5
“0
”
“1
”
“0
”
“1
”
“0
”
“1
”
CM
6
C
M
6
C
M
6
C
M
6
CM7=0(4 MHz selected)
CM6=1(middle-speed)
CM5=0(XIN oscillating)
CM4=0(32 kHz stopped)
1: Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.)
2: The all modes can be switched to the stop mode or the wait mode and return to the source mode when the stop mode or the wait
mode is ended.
3: Timer operates in the wait mode.
4: When the stop mode is ended, a delay of approximately 1 ms occurs by Timer 1 in middle-/high-speed mode.
5: When the stop mode is ended, a delay of approximately 0.25 s occurs by Timer 1 in low-speed mode.
6: The example assumes that 4 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin.
φ indicates the internal system clock.
Middle-speed mode
(
φ =1 MHz)
Middle-speed mode
(
φ =1 MHz)
CM7=0(4 MHz selected)
CM6=0(high-speed)
CM5=0(XIN oscillating)
CM4=0(32 kHz stopped)
High-speed mode
(
φ =4 MHz)
CM7=0(4 MHz selected)
CM6=0(high-speed)
CM5=0(XIN oscillating)
CM4=1(32 kHz oscillating)
High-speed mode
(
φ =4 MHz)
CM7=1(32 kHz selected)
CM6=0(high-speed)
CM5=0(XIN oscillating)
CM4=1(32 kHz oscillating)
Low-speed mode
(
φ =16 kHz)
CM7=1(32 kHz selected)
CM6=0(high-speed)
CM5=1(XIN stopped)
CM4=1(32 kHz oscillating)
CM7=0(4 MHz selected)
CM6=1(middle-speed)
CM5=0(XIN oscillating)
CM4=1(32 kHz oscillating)
CM7=1(32 kHz selected)
CM6=1(middle-speed)
CM5=0(XIN oscillating)
CM4=1(32 kHz oscillating)
Low-speed mode
(
φ =16 kHz)
CM7=1(32 kHz selected)
CM6=1(middle-speed)
CM5=1(XIN stopped)
CM4=1(32 kHz oscillating)
Low-power dissipation mode
( =16 kHz)
φ
Low-power dissipation mode
( =16 kHz)
φ
Notes
Fig. 82 State transitions of system clock
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