參數(shù)資料
型號(hào)： M44C588
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER
文件頁(yè)數(shù)： 5/44頁(yè)
文件大?。?/td> 549K
代理商： M44C588
M44C588
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 11-Nov-97
13 (44)
1.5.2
Oscillator Circuits and External
Clock Input Stage
The M44C588 clock system consists of four different in-
ternal oscillators: two RC-oscillators, one 4-MHz crystal
oscillator, one 32-kHz crystal oscillator and an external
clock input stage.
RC-Oscillator 1 Fully Integrated
For timing insensitive applications, it is possible to use
the fully integrated RC oscillator 1. It operates without
any external components and saves additional costs. The
RC–oscillator 1 center frequency tolerance is better than
±25% over the full temperature and voltage range. The
frequency tolerance is better than
±10% for a given volt-
age and temperature (see diagram ). The basic center
frequency of the RC-oscillator 1 is programmable with
the RC1– and the RC0-bit in the SC register (see page 15).
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 SYSCmax
the core operates will therefore be SCLIN/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 resolution
oscillator
whereby the oscillator frequency can be trimmed with an
external resistor between SCLIN and VDD. In this
configuration, 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: An SYSCLmax frequency of 2 MHz, can be
obtained by connecting a resistor Rext = 136 k
W (see
figures 13 and 47).
RC
oscillator 2
RcOut2
Stop
RcOut2
Osc–Stop
13377
R
Trim
SCLIN
R
ext
V
DD
Figure 13. RC-oscillator 2
4-MHz Oscillator
The integrated system clock oscillator expects a crystal or
ceramic resonator connected to the OSCIN and OSCOUT
pins to establish oscillation. All the necessary oscillator
circuitry, with the exception of the actual crystal,
resonator and the optional C3 and C4 are integrated on-
chip.
4–MHz
oscillator
4Out
Stop
4Out
Osc–Stop
13379
OSCIN
OSCOUT
*
Oscin
C1
*
C2
Oscout
Cer.
Res
*
mask option
C3
C4
XTAL
Figure 14. System clock oscillator
32-kHz Oscillator
Some applications require long-term time keeping or low
resolution timing. In this case, an on–chip, low power
32-kHz crystal oscillator can be used to generate both the
SUBCL and/or the SYSCL. In this mode, power
consumption is greatly reduced. The 32-kHz crystal
oscillator is still operating (not stopped) during any pow-
er-down/SLEEP mode.
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