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参数资料
型号： M38227MCA-XXXHP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP80
封装： 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数： 37/59页
文件大小： 900K
代理商： M38227MCA-XXXHP
Rev.1.20
Dec 24, 2003
page 42 of 57
3822 Group (A ver.)
Fig. 42 State transitions of system clock
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.
φ 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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