參數(shù)資料
型號： M38514E6-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO42
封裝： 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù)： 43/91頁
文件大?。?/td> 1161K
代理商： M38514E6-XXXFP
Rev.1.01
Oct 15, 2003
page 48 of 89
3851 Group (Built-in 24 KB or more ROM)
Fig. 56 State transitions of system clock
CM4 : Port Xc switch bit
0 : I/O port function (stop oscillating)
1 : XCIN-XCOUT oscillating function
CM5 : Main clock (XIN- XOUT) stop bit
0 : Operating
1 : Stopped
CM7, CM6: Main clock division ratio selection bits
b7 b6
0
0 :
φ = f(XIN)/2 ( High-speed mode)
0
1 :
φ = f(XIN)/8 (Middle-speed mode)
1
0 :
φ = f(XCIN)/2 (Low-speed mode)
1
1 : Not available
Notes
Reset
C
M
4
“1
”
←→
“0
”
C
M
4
“0
” ←→
“1
”
C
M
6
“1
” ←→
“0
”
C
M
4
“1
” ←→
“0
”
C
M
6
“1
” ←→
“0
”
C
M
7
“1
”
←→
“0
”
C
M
4
“1
”
←→
“0
”
C
M
5
“1
”
←→
“0
”
CM6
“1”
←→ “0”
CM6
“1”
←→ “0”
CPU mode register
b7
b4
CM
7
“0
” ←→
“1
”
CM
6
“1
” ←→
“0
”
(CPUM : address 003B16)
CM7 = 0
CM6 = 1
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (32 kHz stopped)
Middle-speed mode
(f(
φ) = 1 MHz)
CM7 = 0
CM6 = 1
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
Middle-speed mode
(f(
φ) = 1 MHz)
CM7 = 0
CM6 = 0
CM5 = 0 (8 MHz oscillating)
CM4 = 0 (32 kHz stopped)
High-speed mode
(f(
φ) = 4 MHz)
CM7 = 1
CM6 = 0
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
Low-speed mode
(f(
φ)=16 kHz)
CM7 = 1
CM6 = 0
CM5 = 1 (8 MHz stopped)
CM4 = 1 (32 kHz oscillating)
Low-speed mode
(f(
φ)=16 kHz)
CM7 = 0
CM6 = 0
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
High-speed mode
(f(
φ) = 4 MHz)
1 : Switch the mode by the allows shown between the mode blocks. (Do not switch between the modes 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 bit 0 of MISRG is “0” and the stop mode is ended, a delay of approximately 1 ms occurs by connecting timer 1 in middle/high-speed
mode.
5 : When bit 0 of MISRG is “0” and the stop mode is ended, the following is performed.
(1) After the clock is restarted, a delay of approximately 256 ms occurs in low-speed mode if Timer 12 count source selection bit is “0”.
(2) After the clock is restarted, a delay of approximately 16 ms occurs in low-speed mode if Timer 12 count source selection bit is “1”.
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.
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