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参数资料
| 型号： | M38234G4HP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 52/64页 |
| 文件大小： | 922K |
| 代理商： | M38234G4HP |
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Rev.2.02
Jun 19, 2007
page 54 of 73
REJ03B0146-0202
3823 Group
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 frequency/2/4/8 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 frequency/2/4/8 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.
8 : f(SUB) is the source oscillation frequency in low-speed mode. f(SUB) shows the oscillation frequency of XCIN or the on-chip oscillator.
Internal clock φ is f(SUB)/2 in the low-speed mode.
9 : Set the CPU mode expansion register in advance when switching to low-speed mode which uses mode divided by 4 and on-chip oscillator.
10: In low speed mode, the system clock φ can be switched to the on-chip oscillator or XCIN. Use the on-chip oscillator control bit (bit 0 in the CPU mode
expansion register) for settings. To set this bit to "0" from "1", wait until XCIN oscillation stabilizes.
CM4 : Port Xc switch bit (Note 1)
0: I/O port (Oscillation stopped)
1: XCIN, XCOUT oscillating function
CM5 :Main clock (XIN–XOUT) stop bit (Note 2)
0: Oscillating
1: Stopped
CM6 :Main clock division ratio selection bit
0: f(XIN)/2 (frequency/2 mode),
or f(XIN)/4 (frequency/4 mode) (Note 3)
1: f(XIN)/8 (frequency/8 mode)
CM7 :Internal system clock selection bit
0: XIN–XOUT selected (frequency/2/4/8 mode)
1: XCIN–XCOUT, or on-chip oscillator selected
(low-speed mode) (Note 4)
CPU mode register
(CPUM : address 003B16)
b7
b4
Rese
t
CM6
“0”
“1”
CM
4
“0”
“1”
CM7 = 0 (8 MHz selected)
CM6 = 1 (Frequency/8)
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (Stopped)
Frequency/8 mode (f(φ) = 1 MHz)
CM7 = 0 (8 MHz selected)
CM6 = 0 (Frequency/2/4)
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (Stopped)
Frequency/2 mode (f(φ) = 4 MHz)
or frequency/4 mode (f(φ) = 2 MHz)
Frequency/2 mode (f(φ) = 4 MHz)
or frequency/4 mode (f(φ) = 2 MHz)
CM7 = 1 (32 kHz or on-chip
oscillator selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (Oscillating)
Low-speed mode (f(SUB)/2)
CM7 = 1 (32 kHz or on-chip
oscillator selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (Oscillating)
Low-speed mode (f(SUB)/2)
CM7 = 1 (32 kHz or on-chip
oscillator selected)
CM6 = 1 (Middle-speed)
CM5 = 1 (8 MHz stopped)
CM4 = 1 (Oscillating)
Low-power dissipation mode
(f(SUB)/2)
CM6
“0”
“1”
CM6
“0”
“1”
CM6
“0”
“1”
CM
4
“0”
“1”
CM
7
“0”
“1”
CM
7
“0”
“1”
CM
5
“0”
“1”
CM
5
“0”
“1”
CM
4
CM
6
“0”
“1”
“0”
“1”
CM
4
CM
6
“0”
“1”
“0”
CM
5
CM
6
“0”
“1”
“0”
“1”
CM
5
CM
6
“0”
“1”
“0”
CM7 = 0 (8 MHz selected)
CM6 = 1 (frequency/8)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (Oscillating)
or EXPCM0 = 1
(On-chip oscillator oscillation)
CM7 = 1 (32 kHz or on-chip
oscillator selected)
CM6 = 0 (high-speed)
CM5 = 1 (8 MHz stopped)
CM4 = 1 (Oscillating)
Low-power dissipation mode
(f(SUB)/2)
CM7 = 0 (8 MHz selected)
CM6 = 0 (Frequency/2/4)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (Oscillating)
or EXPCM0 = 1
(On-chip oscillator oscillation)
On-chip oscillator control bit
0 : On-chip oscillator not used
(on-chip oscillator stopping)
1 : On-chip oscillator used (Note 1)
(on-chip oscillator oscillating)
Frequency/4 mode control bit (Note 2)
(Valid only when high-speed mode)
0 : Frequency/2 mode φ = f(XIN)/2
1 : Frequency/4 mode φ = f(XIN)/4
Not used (returns “0” when read)
(Do not write “1” to this bit)
CPU mode extension register
(EXPCM : address: 002B16,)
b7
b4
Note 1 : The on-chip oscillator is selected for the operation clock
in low-speed mode regardless of XCIN-XCOUT.
2 : Valid only when the main clock division ratio selection bit
(bit 6 in the CPU mode register) is set to "0".
When "1" (frequency/8 mode) is selected for the main clock
division ratio selection bit or when the internal system clock
selection bit is set to 1, set "0" to the frequency/4 mode control bit.
Note 1 : In low speed mode (XCIN is selected as the system clock ”),
XCIN-XCOUT oscillation does not stop even if the port XC switch bit
is set to "0".
2 : In frequency/2/4/8 mode, XIN-XOUT oscillation does not stop even if
the main clock (XIN-XOUT) stop bit is set to "1".
3 : When the system clock φ is divided by 4 of f(XIN), set the bit 6 in
the CPU mode register to “0” after setting the bit 1 in the CPU
mode extension register to “1”.
4 : When using the on-chip oscillator in low-speed mode, set the bit 7
in the CPU mode register to “1” after setting the bit 0 in the CPU
mode extension register to “1”.
Fig. 57 State transitions of system clock
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