參數(shù)資料
型號： M37549G2-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數(shù)： 44/86頁
文件大小： 1375K
代理商： M37549G2-XXXFP
Rev.2.02
Mar 31, 2009
Page 47 of 81
REJ03B0202-0202
7549 Group
Fig 64. Structure of clock mode register
Note
Switching to XIN/XCIN Oscillator
After a reset is cleared, operation starts using the low-speed on-
chip oscillator. When switching to XIN/XCIN oscillator, make
sure to set a sufficient wait duration with the on-chip oscillator to
allow the XIN/XCIN oscillator to stabilize.
Low-speed on-chip oscillator oscillation control bit
(Notes 1, 2, and 4)
0: Oscillation start
1: Oscillation stop
High-speed on-chip oscillator oscillation control bit
(Notes 2 and 4)
0: Oscillation start
1: Oscillation stop
XIN/XCIN oscillation control bit (Notes 2 and 4)
0: Oscillation start
1: Oscillation stop
Oscillation stabilization time set bit after release of the
STP instruction
0: Timer 1 set to “0116” and prescaler 12 to “FF16”
automatically
1: Un-automatically
Clock selection bits (Notes 3 and 4)
b5 b4
0 0 : Low-speed on-chip oscillator
0 1 : High-speed on-chip oscillator
1 0 : XIN/XCIN oscillation, External clock
1 1 : Not available
Clock division ratio selection bit
b7 b6
0 0 :
φSOURCE/8 (low-speed mode)
0 1 :
φSOURCE/4 (middle-speed mode)
1 0 :
φSOURCE/2 (high-speed mode)
1 1 : No division (double-speed mode)
b7
Clock mode register
(CLKM: address 003716, initial value: 0216)
b0
Notes 1: When stopping the low-speed on-chip oscillator is disabled by setting the low-speed
on-chip oscillator control bit (bit 4 in FSROM2), “1” cannot be written to this bit.
The low-speed on-chip oscillator does not stop even in stop mode.
2: “1” cannot be written to the oscillation control bits (bits 2 to 0) of the clock selected
as
φSOURCE by the clock selection bits.
3: When “oscillation pins not used” is set by the oscillation method selection bits (bits 1
and 0 in FSROM1), “102” cannot be written to these bits.
4: Do not change the values of the clock selection bits and the clock oscillation control
bits at the same time using a single instruction. Always use different instructions to
rewrite these values.
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