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參數(shù)資料
| 型號： | P83CL882 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 80C51 Ultra Low Power ULP telephony controller |
| 中文描述： | 80C51的超低功耗無鉛汽油電話控制器 |
| 文件頁數(shù)： | 7/88頁 |
| 文件大?。?/td> | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
7
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6
FUNCTIONAL DESCRIPTION
6.1
Oscillator circuitry
The on-chip Amplitude Controlled Oscillator (ACO)
circuitry is a single-stage inverting amplifier biased by an
internal feedback resistor R
fb
. The oscillator circuit is
shown in Fig.3.
Two comparators with different characteristics can be
used with the on-chip crystal oscillator. The first one is an
analog comparator built around a differential amplifier and
is intended to be selected when an external ceramic or
crystal resonator is connected to the chip.
The other comparator has a Schmitt trigger input with
a bigger hysteresis which is especially useful when the
P83CL882 is driven from an external clock source.
Two bits in the SYSCON SFR: SELECT and XTM, are
used to configure the oscillator. The SELECT bit
(SYSCON.1) enables the analog comparator or the
hysteresis comparator.
With XTM (SYSCON.0) = 1 (or in Power-down mode;
PCON.1 = 1) the oscillator is switched off and the current
consumption of the oscillator is reduced to zero.
Table 2
Comparator select bits in SYSCON SFR
6.1.1
C
LOCK OSCILLATOR CONNECTIONS
No external components are needed when a quartz crystal
is used to drive the oscillator. When an external ceramic
resonator is used to drive the oscillator, external
components may be required dependingupon the ceramic
resonator type; refer to the product specification. Two
different resonator configurations are shown in
Figs 4a and 4b.
Todrivethedevicewithanexternalclocksource,applythe
external clock signal to XTAL1, and leave XTAL2 floating,
as shown in Fig.4c. If the amplitude of the input signal is
less than V
DD
to V
SS
or if a sine wave is applied, capacitive
decoupling is needed as shown in Fig.4d.
SELECT
XTM
DESCRIPTION
0
0
oscillator enabled; analog comparator
enabled
don’t use
oscillator enabled; hysteresis
comparator enabled
oscillator stopped; hysteresis
comparator enabled
0
1
1
0
1
1
XTAL2
SELECT
XTAL1
XTM
Rfb
enable
enable
ANACOMP
enable
HYSTCOMP
PSC1
fpsc
PSC2
fper
fosc
MGT281
Fig.3 Oscillator.
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