參數(shù)資料
型號(hào)： M34508G4-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封裝： 5.30 X12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁(yè)數(shù)： 64/106頁(yè)
文件大小： 1059K
代理商： M34508G4-XXXFP
Rev.1.03
2009.07.27
page 58 of 140
REJ03B0148-0103
4508 Group
(5) External clock
When the external signal clock is used for the main clock (f(XIN)),
connect the XIN pin to the clock source and leave XOUT pin open
(Figure 54). Do not execute the CRCK instruction in program.
Be careful that the maximum value of the oscillation frequency when
using the external clock differs from the value when using the ce-
ramic resonator (refer to the recommended operating condition).
Also, note that the RAM back-up mode (POF instruction) cannot be
used when using the external clock.
(6) Clock control register MR
Register MR controls the selection of operation mode and the opera-
tion source clock, and enable/stop of main clock. Set the contents of
this register through register A with the TMRA instruction. In addition,
the TAMR instruction can be used to transfer the contents of register
MR to register A.
(7) Clock control register RG
Register RG controls the on-chip oscillator. Set the contents of this
register through register A with the TRGA instruction.
Table 23 Clock control register MR
Fig. 54 External clock input circuit
4508
XIN
XOUT
External oscillation circuit
VDD
VSS
Do not execute the CRCK
instruction in program.
*
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: Main clock cannot be stopped when the main clock is selected for the operation source clock.
3: The stopped clock cannot be selected for the operation source clock. In order to switch the operation source clock, generate the oscillation stabiliz-
ing wait time by software first and set the oscillation of the destination clock to be enabled.
4: On-chip oscillator cannot be stopped when the on-chip oscillator is selected for the operation source clock.
5: When changing the setting of MR1 and MR0 from “00” to “11”, make settings in the sequence “00” → “01” → “11”.
When changing the setting of MR1 and MR0 from “11” to “0”, make settings in the sequence “11” → “01” → “00”.
MR3
Clock control register MR
Operation mode
Through mode (frequency not divided)
Frequency divided by 2 mode
Frequency divided by 4 mode
Frequency divided by 8 mode
Main clock (f(XIN)) oscillation enabled
Main clock (f(XIN)) oscillation stop
Main clock (f(XIN))
On-chip oscillator clock (f(RING))
at reset : 11012
at RAM back-up : 11012
MR3
0
1
R/W
TAMR/TMRA
Main clock f(XIN) control bit (Notes 2, 5)
Operation source clock selection bit (Notes 3, 5)
Operation mode selection bits
0
1
0
1
MR2
0
1
0
1
MR1
MR0
MR2
0
1
On-chip oscillator (f(RING)) oscillation enabled
On-chip oscillator (f(RING)) oscillation stop
On-chip oscillator (f(RING)) control bit
(Note 4)
Clock control register RG
W
TRGA
at RAM back-up : 02
at reset : 02
RG0
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