參數(shù)資料
型號(hào)： M38257M8-XXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁(yè)數(shù)： 39/70頁(yè)
文件大小： 994K
代理商： M38257M8-XXXFP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3825 Group
44
Fig. 44 State transitions of internal clock
φ
Notes 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 returned to the source mode when the stop mode or the wait
mode is ended.
3: Timer and LCD operate in the wait mode.
4: When the stop mode is ended, a delay of approximately 1 ms occurs automatically by timer 1 and timer 2 in middle-/high-speed mode.
5: When the stop mode is ended, a delay of approximately 0.25 s occurs automatically by timer 1 and timer 2 in low-speed mode.
6: Wait until oscillation stabilizes after oscillating the main clock XIN before the switching from the low-speed mode to middle-/high-
speed mode.
7: The example assumes that 8 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin. f indicates the internal clock.
CM4 : Port Xc switch bit
0: I/O port
1: XCIN, XCOUT
CM5 : Main clock (XIN–XOUT) stop bit
0: Oscillating
1: Stopped
CM6 : Main clock division ratio selection bit
0: f(XIN)/2 (high-speed mode)
1: f(XIN)/8 (middle-speed mode)
CM7 : Internal system clock selection bit
0: XIN–XOUT selected
(middle-/high-speed mode)
1: XCIN–XCOUT selected
(low-speed mode)
CPU mode register
(CPUM : address 003B16)
b7
b4
Reset
CM6
“0”
“1”
C
M
4
“0
”
“1
”
CM7 = 0 (8 MHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (32 kHz stopped)
Middle-speed mode (f(
φ) = 1 MHz)
CM7 = 0 (8 MHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
Middle-speed mode (f(
φ) = 1 MHz)
CM7 = 0 (8 MHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (32 kHz stopped)
High-speed mode (f(
φ) = 4 MHz)
CM7 = 0 (8 MHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
High-speed mode (f(
φ) = 4 MHz)
CM7 = 1 (32 kHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
Low-speed mode (f(
φ) =16 kHz)
CM7 = 1 (32 kHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
Low-speed mode (f(
φ) =16 kHz)
CM7 = 1 (32 kHz selected)
CM6 = 1 (Middle-speed)
CM5 = 1 (8 MHz stopped)
CM4 = 1 (32 kHz oscillating)
Low-speed mode (f(
φ) = 16 kHz)
CM7 = 1 (32 kHz selected)
CM6 = 0 (High-speed)
CM5 = 1 (8 MHz stopped)
CM4 = 1 (32 kHz oscillating)
Low-speed mode (f(
φ) =16 kHz)
CM6
“0”
“1”
CM6
“0”
“1”
CM6
“0”
“1”
C
M
4
“0
”
“1
”
C
M
7
“0
”
“1
”
C
M
7
“0
”
“1
”
C
M
5
“0
”
“1
”
C
M
5
“0
”
“1
”
C
M
4
C
M
6
“0
”
“1
”
“0
”
“1
”
C
M
4
C
M
6
“0
”
“1
”
“1
”
“0
”
C
M
5
C
M
6
“0
”
“1
”
“0
”
“1
”
C
M
5
C
M
6
“0
”
“1
”
“1
”
“0
”
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