參數(shù)資料
型號(hào)： M34559G6-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝： 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁(yè)數(shù)： 66/70頁(yè)
文件大?。?/td> 1799K
代理商： M34559G6-XXXFP
Rev.1.04
Aug 23, 2007
Page 7 of 146
REJ03B0188-0104
4559 Group
DEFINITION OF CLOCK AND CYCLE
Operation source clock
The operation source clock is the source clock to operate this
product. In this product, the following clocks are used.
Clock (f(XIN)) by the external ceramic resonator
Clock (f(XIN)) by the external RC oscillation
Clock (f(XIN)) by the external input
Clock (f(RING)) of the on-chip oscillator which is the internal
oscillator
Clock (f(XCIN)) by the external quartz-crystal oscillation
System clock (STCK)
The system clock is the basic clock for controlling this product.
The system clock is selected by the clock control register MR
shown as the table below.
Machine cycle
The machine cycle is the standard cycle required to execute the
instruction.
Instruction clock (INSTCK)
The instruction clock is the basic clock for controlling CPU. The
instruction clock (INSTCK) is a signal derived by dividing the
system clock (STCK) by 3. The one instruction clock cycle
generates the one machine cycle.
Note 1. The f(RING)/8 is selected after system is released from reset
Table 6
Table Selection of system clock
Register MR
System clock
Operation mode
MR3
MR2
MR1
MR0
1
0
f(STCK) = f(RING)/8
Internal frequency divided by 8 mode
1
0
f(STCK) = f(RING)/4
Internal frequency divided by 4 mode
0
1
0
f(STCK) = f(RING)/2
Internal frequency divided by 2 mode
0
f(STCK) = f(RING)
Internal frequency through mode
1
0
1
f(STCK) = f(XIN)/8
High-speed frequency divided by 8 mode
1
0
1
f(STCK) = f(XIN)/4
High-speed frequency divided by 4 mode
0
1
0
1
f(STCK) = f(XIN)/2
High-speed frequency divided by 2 mode
0
1
f(STCK) = f(XIN)
High-speed through mode
1
0
f(STCK) = f(XCIN)/8
Low-speed frequency divided by 8 mode
1
0
1
0
f(STCK) = f(XCIN)/4
Low-speed frequency divided by 4 mode
0
1
0
f(STCK) = f(XCIN)/2
Low-speed frequency divided by 2 mode
0
1
0
f(STCK) = f(XCIN)
Low-speed through mode
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