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): 73/88頁
文件大?。?/td> 328K
代理商: P83CL882
2001 Jun 19
73
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
9.3.1
E
XAMPLE OF RING
-
DETECTION
Typically a ring-detection is done by a time measurement using a timer. The device is activated by an external interrupt
(e.g. AC on the A/B line), the oscillator runs up and the device carries out the time measurement with a timer.
In this example it can be assumed that to read the timer contents, decide whether an external ringer should be enabled
or not, to restart the timer and then go into Idle mode is around 30 instructions. Assuming a ringing frequency of about
25 Hz and a device supply voltage of 3.0 V this gives a CPU performance of about 4.5 Mips.
The CPU processing load is then:
From the calculation above it can be seen that the idle current will be dominant in this application part.
100%
30 instructions
4.5 Mips
×
25 Hz
×
1000000
×
0.017%
MGT314
A/B line
Activity
CPU operation
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
Fig.34 Ring-detection sequence.
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