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參數(shù)資料
| 型號： | P8XC557E8 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 50/84頁 |
| 文件大小： | 322K |
| 代理商： | P8XC557E8 |
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1999 Mar 12
50
Philips Semiconductors
Product specification
8-bit microcontroller
P8xC557E8
16.2.4
S
ECONDS
T
IMER
This counter provides an overflow signal every second,
when the 32 kHz oscillator is running. The overflow output
sets the interrupt flag SECINT. This interrupt can be
disabled/enabled by ENSECI. If SECINT is enabled, it is
logically ORed with INT1 (External interrupt 1).
The ‘seconds’ interrupt andINT1 therefore share the same
priority and vector. The software has to check both flags
SECINT (PLLCON.5) and IE1 (TCON.3) to distinguish
between the two interrupt sources. SECINT can only be
cleared via writing a logic 0 to this bit.
The external interruptsINT0,INT1 or the seconds interrupt
can wake-up the PLL oscillator and the microcontroller as
described in Chapter 15.3. For a wake-up via INT1 or
seconds interrupt, IE1 must be enabled and
level-sensitive.
A further function of the seconds timer is to control the
start-up timing of the microcontroller after reset or after
wake-up from Power-down.
It controls the stretching of the reset pulse to the
microcontroller and controls releasing the system clock to
the microcontroller. A RSTIN signal of 1
μ
s at minimum will
reset the microcontroller.
In the even of reset or wake-up with halted 32 kHz
oscillator: from RSTIN falling edge or wake-up interrupt
it takes 560 ms at maximum for the start-up of the
32 kHz oscillator itself and the stabilization of the PLLs.
In the event of wake-up with running 32 kHz oscillator:
from wake-up interrupt it takes about 10 ms for the
stabilization of the PLLs.
After this start-up time, the microcontroller is supplied with
the system clock and - in case of a reset - the internally
stretched reset signal overlaps about 45
μ
s, to guarantee
a proper initialization of the microcontroller.
For further information refer to Chapter 15.
Fig.19 Block diagram PLL.
handbook, full pagewidth
MBH086
32 kHz
OCSILLATOR
PHASE
COMPARATOR
Rf
C1
C2
LOOP
FILTER
CCO
32.768 kHz
XTAL3
XTAL4
PROGRAMMABLE
DIVIDER
PLLCON
SECONDS TIMER
PD
PD
RUN32
RSTIN
INTERNAL BUS
'seconds'
interrupt
request
reset to
controller
system
clock
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