參數(shù)資料
型號: M34551E8FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 138/155頁
文件大?。?/td> 1329K
代理商: M34551E8FP
4551 Group User’s Manual
APPLICATION
2-5
2.1 I/O pins
(3)
Clock control register MR
The oscillation circuit control bit is assigned to the bit 2 of the clock control register MR.
Set the contents of this register through register A with the TMRA instruction.
The contents of register MR is transferred to register A with the TAMR instruction.
Table 2.1.3 shows the clock control register MR.
Table 2.1.3 Clock control register MR
Clock control register MR
at reset : 10002
at power down : state retained
R/W
MR0 = 0
f(XIN)
MR0 = 1
f(XCIN)
MR0 = 0
f(XIN)/4
MR0 = 1
f(XCIN)/4
(XCIN) oscillation stop, ports D6, D7 selected
(XCIN) oscillation enabled, ports D6, D7 not selected
Oscillation enabled
Oscillation stop
f(XIN)
f(XCIN)
System clock (STCK) selection
bit
f(XCIN) oscillation circuit control
bit
f(XIN) oscillation circuit control bit
Clock selection bit
0
1
0
1
0
1
0
1
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: When setting ports, MR3, MR1, MR0 are not used.
3: Do not stop the oscillation circuit selected with the clock selection bit (MR0).
Note the stop of the oscillation circuit selected with the clock selection bit (MR0) if the following
setting is performed.
Example 1: (MR3MR2MR1MR0) = !0!1 (f(XCIN) selected, f(XCIN) oscillation stop)
Example 2: (MR3MR2MR1MR0) = !!10 (f(XIN) selected, f(XIN) oscillation stop)
!: “0” or “1.”
MR3
MR2
MR1
MR0
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