參數(shù)資料
型號(hào)： M44C510D-XXX-DOW
廠商： TEMIC SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, MROM, MICROCONTROLLER
封裝： SSOP-44
文件頁(yè)數(shù)： 6/60頁(yè)
文件大小： 709K
代理商： M44C510D-XXX-DOW
M44C510E
Rev. A1, 04-May-00
Preliminary Information
14 (60)
Table 5. Clock modes
Mode
Clock Source for SYSCL
Clock Source for SUBCL
OS1
OS0
CCS = 1
CCS = 0
CCS = 1
CCS = 0
1
1
1
RC-oscillator 1 (intern)
External input clock
SYSCL max/64
SCLIN / 128
2
0
1
RC-oscillator 1 (intern)
RC-oscillator 2 with
external trimming resistor
SYSCL max/64
SYSCL max/64
3
1
0
RC-oscillator 1 (intern)
4-MHz oscillator
SYSCL max/64
fxtal / 128
4
0
0
RC-oscillator 1 (intern)
32-kHz oscillator
32 kHz
1.5.2
Oscillator Circuits and External
Clock Input Stage
RC-Oscillator 1 Fully Integrated
For timing insensitive applications, it is possible to use
the fully integrated RC oscillator 1. This operates without
any external components and thus saves on component
costs. The RC-oscillator 1 frequency tolerance is better
than
±50% over the full temperature and voltage range.
A reduction in the application operating supply voltage
and temperature ranges will result in an improved fre-
quency tolerance. For more detailed information see
figures 53 – 55. The basic center frequency of the RC-os-
cillator 1 is programmable with the RC1 and the RC0-bits
in the SC register (see page 16).
RC
oscillator 1
RcOut1
Stop
Control
RcOut1
Osc–Stop
13375
RC1
RC0
Figure 11. RC-oscillator 1
External Input Clock
The SCLIN pin can be driven by an external clock source
provided it meets the specified input levels, duty cycle,
rise and fall times. The maximum system clock frequency
fSYSCLmax that the core can operate is fSCLIN/2 (see
figure 10).
Ext. input clock
ExOut
Stop
Ext.
Clock
ExOut
Osc–Stop
13376
ExIn
SCLIN
Figure 12. External input clock
RC-Oscillator 2 with External Trimming
Resistor
The RC-oscillator 2 is a high stability oscillator whereby
the oscillator frequency can be trimmed with an external
resistor connected between SCLIN and VDD. In this
configuration, as long as the system clock frequency does
not exceed 2 MHz, the RC-oscillator 2 frequency can be
maintained stable to within a tolerance of
± 10% over the
full operating temperature and voltage range.
For example: A SYSCLmax frequency of 2 MHz, can be
obtained by connecting a resistor Rext = 150 k
W (see
figures 13, 50, 51 and 52).
RC
oscillator 2
RcOut2
Stop
RcOut2
Osc–Stop
13377
R
Trim
SCLIN
R
ext
V
DD
Figure 13. RC-oscillator 2
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