參數(shù)資料
型號： P83C834CFP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-bit microcontrollers with LCD-driver
中文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁數(shù)： 9/36頁
文件大小： 165K
代理商： P83C834CFP
1997 Jul 03
9
Philips Semiconductors
Product specification
8-bit microcontrollers with LCD-driver
P83C434; P83C834
6.2
Oscillator
6.2.1
CPU
CLOCK
The internal timing circuits of the CPU are clocked by a
Current Controlled Oscillator (CCO). The oscillator is free
running and is adjusted by means of the Oscillator Control
Register (OSCON; see Section 6.6.4) and a
digital-to-analog converter; it does not require external
components. The frequency of the CPU clock can be
measured by means of Timer T0 which is clocked by the
32 kHz oscillator (see Section 6.2.2).
Adjustments can be made by changing the contents of the
OSCON register (see Fig.9). Over the range 0 to 31 the
frequency
step
size is constant (deviation
≤
10%).
The frequency variation per
step
of the register is:
0.5 MHz < step size < 2 MHz.
At Power-on-reset the oscillator frequency will be:
1 MHz < f
OSC
< 4 MHz. Stability of the oscillator:
frequency change with time
≤
1.5%. The maximum
operating frequency is:
≤
12 MHz at V
DD
≥
4.5 V.
The minimum operating frequency is 1 MHz.
In Power-down mode the oscillator is stopped.
6.2.2
LCD
DRIVER CLOCK
: 32
K
H
Z OSCILLATOR
A 32 kHz oscillator provides the clocking of the LCD timing
generator and may also be used as the time base for a
Real Time Clock. The output of the 32 kHz oscillator is also
used as an input of Timer/Counter 0.
The frequency of the 32 kHz oscillator need not be exactly
32 kHz, and is determined by the component(s) connected
between pins XTAL1 and XTAL2. See Chapter 11.
The oscillator is suitable for use with either:
A crystal; connected as shown in Fig.6a
External drive; connected as shown in Fig.6b.
During Power-down mode, the control bit RUN32 in the
Miscellaneous Control Register (MCON) determines
whether the oscillator is stopped or running continuously;
see Table 3.
The output of the oscillator (XTAL2) is used as an input to
the Timer/Counter 0. This can be useful for accurate time
measurements and generation of time-slots. For example
it may be used to determine (and possibly adjust) the
frequency of the CCO that is used for the CPU clock.
Table 3
Oscillator status during Power-down mode
6.2.3
15-
BIT COUNTER
(1-
SECOND
T
IMER
)
An interrupt is generated every second by the 15-bit
counter. This 1-second timer is a 15-bit counter, clocked
by the 32 kHz oscillator output. When this counter
overflows it generates an INT1 interrupt by setting SECINT
in the Miscellaneous Control Register (MCON). Reset of
this interrupt is carried out via software by clearing bit
SECINT.
RUN32
32 kHz OSCILLATOR
HIGH
LOW
running
stopped
handbook, halfpage
MLC928
XTAL1
XTAL2
Fig.6 Oscillator configurations P83C434/P83C834.
handbook, halfpage
MBE312
XTAL1
XTAL2
n.c.
external clock
(not TTL compatible)
a. Crystal oscillator.
b. External clock drive.
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