參數(shù)資料
型號(hào)： P90CE201
廠商： NXP Semiconductors N.V.
英文描述： 16-bit microcontroller
中文描述： 16位微控制器
文件頁(yè)數(shù)： 27/77頁(yè)
文件大?。?/td> 235K
代理商： P90CE201
August 1993
27
Philips Semiconductors
Product specification
16-bit microcontroller
P90CE201
6.5
Clock circuitry
The oscillator circuit of the P90CE201 is a single-stage
inverting amplifier in a Pierce oscillator configuration. The
circuitry between XTAL1 and XTAL2 is basically an
inverter biased to the transfer point. Either a crystal or
ceramic resonator can be used as the feedback element to
complete the oscillator circuitry. Both are operated in
parallel resonance. XTAL1 is the high gain amplifier input,
and XTAL2 is the input; see Fig.22. To drive the
P90CE201 externally, XTAL1 is driven from an external
source and XTAL2 left open-circuit; see Fig.23.
The P90CE201 is specified for a maximum crystal
frequency of 24 MHz. The internal clock frequency is the
crystal frequency (f
XTAL
) divided by 2. For some
peripherals such as the UART and Watchdog Timer, a
main prescaler generates a basic peripheral clock.
Frequencies other than the basic peripheral clock will be
generated within the peripherals. The prescaler is
programmed by register SYSCON2. Table 15 shows the
frequencies of the basic peripheral clock generated by the
main prescaler.
Table 15
Basic peripheral clock frequencies.
f
XTAL
(MHz)
f
INT
(MHz)
f
INT
DIVISOR (MHz)
3
2.5
2
1.5
24
20
16
12
12
10
8
6
4.00
3.33
2.66
2.00
4.80
4.00
3.20
2.40
6.00
5.00
4.00
3.00
8.00
6.66
5.33
4.00
Fig.22 Oscillator circuit.
handbook, halfpage
C1
XTAL1
XTAL2
20 pF
C2
MLA763
20 pF
Fig.23 Driving from an external source.
handbook, halfpage
XTAL1
XTAL2
MLA764
external clock
(not TTL compatible)
not connected
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